Đồng nghĩa của tough nut to crack

Adjective

Stubbornly, and usually unreasonably, holding to an opinion, decision or purpose
obdurate obstinate stubborn implacable inflexible adamant unbending unrelenting unyielding firm immovable intransigent mulish relentless stiff-necked wilful determined dogged fixed headstrong inexorable intractable iron hard persistent uncompromising unshakeable bull-headed tenacious indurate pertinacious steadfast strong-minded unmalleable unpersuadable adamantine bloody-minded bullheaded contumacious hardened hardheaded hard-nosed inconvincible iron-willed opinionated ossified pat perverse pigheaded refractory self-opinionated self-willed stony willful unimpressible bullhead hardhearted harsh impertinent mean recalcitrant rigid tough uncompassionate uncooperative unemotional unrepentant unshakable cold fish hanging tough proof against persuasion set in stone resolute unwavering single-minded persevering contrary strong-willed unflinching balky froward unmanageable insistent staunch difficult indefatigable unswerving unreasonable purposeful incompliant resolved steely unfaltering stalwart set cussed indomitable insubordinate defiant strict bolshie wayward disobedient stiff steady unflagging rebellious cantankerous obstreperous intent ungovernable unaccommodating hard-line committed rock-ribbed tireless strong restive stroppy untoward unbendable unruly solid dedicated dead set bound awkward earnest decided undeviating cross-grained grim uncompliant rigorous assiduous rebel stubborn as a mule constant uncontrollable recusant untiring troublesome importunate remorseless spirited stringent unshaken forceful locked in renitent hardline contrarious fractious unmovable dead set on decisive set in one's ways tiresome unhesitating undisciplined deaf to reason ornery true stern pervicacious unsparing annoying thrawn undaunted obstructive disobliging vigorous unadaptable sedulous severe full of determination diehard wild driven brassbound stout unhelpful exacting bold die-hard mettlesome stable pig-headed gritty ruthless perseverant hard and fast diligent vexatious unswayable pitiless serious emphatic wrong-headed mutinous noncompliant deliberate ardent unappeasable plucky bound and determined assertive unchangeable bent upon merciless immutable gutsy pushy unalterable spunky demanding rugged patient bent faithful unchanging sure four-square hard-core loyal devoted purposive dyed-in-the-wool do-or-die manful zealous fanatical bent on draconian bulldog hell-bent on hell-bent upon brave authoritarian devout resistant courageous indocile focused cruel aggressive strenuous enduring immobile settled avid valiant keen critical unpredictable oppressive dour incorrigible imperious trying stout-hearted incontrollable undisciplinable unforgiving true-blue domineering definite persisting energetic unswervable out iron-fisted fierce focussed dogmatic heavy-handed cast-iron meaning business feisty tyrannical standing one's ground dependable go-getting blinkered self-assertive hard as nails arbitrary capricious haughty exigent mule reliable clamorous ambitious unremitting pressing unfailing picky nagging locked unwilling trustworthy disciplinary trusty fast motivated insuppressible unrestrainable insurgent uptight obstinately disobedient invariable good obsessed enterprising unbreakable hungry unpermissive dire unflappable allegiant ill-natured crabby disorderly fussy enthusiastic obsessive monomaniacal tough nut industrious non-compliant eager narrow-minded unmoving thirsty desirous active inspired overbearing unamenable compulsive positive not giving an inch established perfectionist delinquent high-pressure brick-wall disputatious aspiring no-nonsense dictatorial possessive militant dug in stand pat wholehearted opinionative hardy assured argumentative querulous hang tough hard to please unabated unqualified standing pat austere hypercritical as stubborn as a mule prickly cynical sturdy negative hell bent on irritable touchy self-starting hard-driving hard-and-fast changeless chippy goal-oriented never-failing intense stop at nothing over-particular self-driven hard to handle hell-bent formidable hard to satisfy self-confident irrational biased illogical inveterate unbudgeable incurable contentious unconverted unreformed prejudiced intolerant mullish estranged seditious disaffected factious irreconcilable alienated firmly-based unsubduable unvacillating frozen petrified stiffened forbidding illiberal insoluble thorny unpliable problematic knotty hidebound intrepid impassive unstoppable game durable immalleable unresponsive fossilized bony indurated rigidified unreceptive boneheaded peevish morose truculent stony-hearted unimpressionable unmoved heady never-tiring cocksure great puritanical aloof proud convinced uncontainable irrepressible unmodifiable permanent quiescent hellbent cohesive sticky pounding mortal hard-headed shrewish inalterable fossilised categorical stuffy coherent rocklike belligerent down-the-line pious stanch insubmissive radical opposing resisting withstanding unregenerate exasperating unforgetful with a will of one's own determined to have one's own way hard-shell locked-in set-on one-sided iron-jawed unplacatable iron-handed unmollifiable inescapable unpacifiable intent on unflexible crisp doctrinaire thick-skinned toughened in for long haul like bad penny stick to guns set in concrete set on irreversible exact concrete clear-sighted all out flat-out straight out tall in the saddle on one's mettle insistent on intent upon determined to committed to the idea of with one's feet dug in with one's toes dug in unvarying static ramrod ineluctable dissident hostile contrariant nonconforming discordant arsey nonconformist paradoxical adverse disagreeing antagonistic do or die hold one's ground hold the fort sticking to one's guns hold the line abiding liege unquestioning tried-and-true set in your ways wrongheaded antipathetic inimical converse dissentient necessary ironclad compulsory judgmental disapproving untameable consumed compelled pesky vexing rocky resilient decided upon writ in stone cut-and-dried strait-laced turbulent violent striving possessed competitive whole-hearted overexacting cavilling disciplinarian callous drastic ascetical by the book absolute astringent uncharitable hard-hearted browbeating extreme rough ascetic unsympathetic autocratic grave confident dynamic galvanized impelled out of control mean business determinate dominant certain in earnest difficult to handle cramped complex bulky discommodious incommodious disagreeable nonmoving cutthroat sustained ferocious robust prevailing inexpugnable seasoned induced fixated obsessional quibbling disparaging sticklerish faultfinding overscrupulous needy hairsplitting caviling censuring cavillous unbudging progressive bloodthirsty pioneering freaked like a loose cannon excited overwhelming beside oneself badly-behaved abandoned lawless overpowering explicit consistent going no going back patriotic nonmotile warlike gladiatorial brutal scrappy pushed steered guided impulsive besetting galvanised dutiful demeaning carping censorious like death and taxes clamant urgent erratic fickle immotile impervious self-asserting full-blooded intensely competitive in-your-face self-seeking fiercely competitive get up and go power-hungry having killer instinct cut-throat dog-eat-dog hang-tough go for broke self-assured can-do eager beaver power-loving gung ho high-reaching self-possessed powerful fit fervent trusted over-rigorous fault-finding over-strict over-exacting over-censorious high-maintenance fastidious boorish finicky through-and-through doughty urged on irremovable genuine oafish bearish irascible discontented dissatisfied tough as old boots red-blooded two-fisted high-powered as tough as old boots hard-bitten impassioned supportive close instant imperative burning crying emergent acute compelling entreating necessitous vexed testy choosy captious snappy temperamental quarrelsome disputative huffy delicate overcritical particular ungracious grumbly finical invidious fiendish sensitive crotchety uppity sour rude irritating impolite impossible unbearable undependable intolerable perfervid fervid naughty errant immoral aberrant secure passionate disturbing solicitous suppliant overeager harassing anchored rooted true-hearted nailed quiet hitched hooked situated attached stationary still located tight tried and true true to life tried and tested badly behaved made fast self-indulgent overly solicitous deep-rooted lasting authoritative entrenched confirmed final ingrained conclusive sound unequivocal continuing long-lasting long-standing clear indubitable indisputable sincere undeniable incontrovertible flat eternal unquestionable unmistakable unassailable deep-seated irrefutable deep unambiguous incontestable lionhearted long-established safe long-lived ineradicable commanding deep-dyed perennial bossy honest long-term vehement convincing evident peremptory tried in the bag undying responsible indelible definitive surviving real guaranteed lifelong remaining sworn known demonstrable card-carrying upright obvious infallible verifiable unfluctuating fearless uniform perpetual true blue everlasting valid conscientious unerring binding bred-in-the-bone honorable honourable undoubted inarguable supreme confirmable even establishable lordly bullish magisterial indestructible masterful out-and-out stated straight plain imperishable well established unfading audacious hard-working immortal clear-cut well-established forward impregnable ascertained profound beyond doubt ongoing patent perdurable beyond question provable through and through sharp trustable invariant mad keen calculable heroic intrenched chronic effective hearty unarguable sure thing regular incommutable high-handed having down pat high-spirited lusty unanswerable unchallengeable despotic express watertight impressive imposing collected proven unending composed manifest predetermined scrupulous predestined destined incorruptible undisputable daring traditional truthful dateless timeless ageless influential indissoluble concentrated persuasive complete agreed thorough dauntless salted away on ice arranged thoroughgoing hard-hitting long-running invulnerable well-founded irrevocable telling heartfelt equable habitual preset specified unafraid irrefragable adherent pushful studious savage accomplished cogent unapologetic unashamed forcible level inured pledged ultimate overweening precise incisive distinct palpable firmly established specific beyond dispute tyrannous autocratical tyrannic undismayed recognized trenchant arrogant stipulated high-principled recognised direct red-hot well-defined implanted invincible absorbed engrossed orthodox poised keen as mustard unconquerable confining behind one pure excessive gallant valorous heavy redoubtable unshrinking basic fundamental unaffected bulletproof concentrating preoccupied inbred uninterrupted time-honoured foolproof unconditional potent unruffled occupied immersed utter independent prearranged airtight continuous inbuilt built-in unsurpassable calm dominating fiery unblinking doubtless cool planned unfazed riveted unsentimental sempiternal nonnegotiable unceasing proved desperate incessant inevitable flinty subconscious lingering inherent innate embedded revering accustomed habituated staid longstanding unchanged defined longtime accepted fortified full-bore self-reliant venerating greathearted gutty stouthearted undauntable heroical old coercive straightforward inexhaustible unbroken resounding decent imperial inseparable solemn undefeatable predictable arrant right-down continual righteous hard-boiled unimpeachable accurate instilled wrapped up effectual ringing significant plausible efficacious weighty lucid intelligent undeterred infixed finished sure of oneself bosom transparent monotonous not in doubt truehearted deeply felt pertinent officious boon undisputed nailed-on impeccable well founded single-minded about firm about stabile deep-down full-fledged well-set obedient not backward in coming forward deep-set resolved to veracious deeply ingrained fail-safe confiding obsessive about loving circumspect as sure as eggs is eggs on the level inflexible about out and out sure-fire fixated on fanatical about carved in stone solid as a rock beyond a shadow of a doubt affectionate string along with clinging self-disciplined mature ended bombproof not joking predisposed tending inclined leaning disposed standing hardboiled buckled down sine qua non like granite pegged unforgettable ineffaceable unaltered immoveable uninfluenced unintimidated free from doubt persuaded satisfied for a fact time-hallowed formal unbeatable gut instinctive intrinsic hopeless endemic unbothered untouched unvaried unmodified moored fastened risk-free self-evident clinching masterly jelled high-stake winner-take-all zero-sum win-or-lose irradicable inannihilable worn low-risk brassy unabashed undebatable punishing punitive Draconian time-honored age-old ancient quantified credible engaged enthralled living steamroller nervy powerhouse allotted riskless hopeful in place in position resolute about driven in beyond hope undoubting poignant acrimonious drawing decreed prescribed spartan bidding ordering limited systematic meticulous painstaking on one's side sagacious attentive impatient imperturbable nerveless preconceived apodictic manly engagé telelogical calculated surefire lengthy extended unwearied Herculean assaultive punitory unsinkable ironhanded onerous congenital undiscouraged insurmountable insuperable rock-hard dinkum tried and trusted dashing unquenchable bitter furious granite lion-hearted carnivorous open and shut dyed-in-the wool mandatory dictated written brusque grounded as thick as thieves impassable never-changing marathon perceptive take charge adoring goody-goody worshipping worshiping heart-and-soul pietistic reputable respectable inerrant questionless failsafe believing in oneself going for broke not subject to change satisfying material crystalline abrupt summary brisk going all the way serious-minded meaning what one says fundamentalist never-ending ceaseless in good faith well grounded uncontested unquestioned unchallenged sealed acknowledged determining insistent about careful incorrupt vicious virulent religious as keen as mustard single-hearted old faithful true to the end given over to can't-miss playing hard ball to the core not put off not discouraged firm in spirit animated tough-minded resourceful weariless observant interminable endless non-stop regimented fixed as the laws of the Medes and the Persians not changeable by the numbers staying put hardhanded not in question conservative reverent reiterative salient etched in stone based on inborn inexpungible forever controlling self-respecting be out for blood nose to the grindstone prayerful goody two-shoes nasty intuitive insightful relevant ingenious adventurous have-a-go fortress-like correct believable disciplined controlled entire all exclusive enrapt whole undivided torrid impenitent irredeemable unreformable plugging jumping go-go grind unstinted hyper perky fireball continued plodding daredevil repressive lofty cold unfeeling abrasive unjust unfair venturesome ballsy death-or-glory moral right just virtuous ethical nice total watchful alert there are no two ways about it all sewn up sicker standardized nonstop homogeneous regularised regularized standardised unappealable uncaring venturous right-minded all-or-nothing cocky dogmatical Neronian imprudent herolike chivalrous chin-up foolhardy as game as Ned Kelly fortitudinous like the Rock of Gibralter solid as rock pugnacious unkind inconsiderate heartless insensitive veridical undistorted square worthy creditable all right estimable deep down in a straight line balanced bona fide in charge high and mighty crack-the-whip throwing weight around egotistic pompous dictative determinative irremediable unreversible case-hardened principled in for the long haul till the cows come home no lie up front all-consuming rowdy intensive curt unrectifiable unrepealable hard-shelled rational adult minding certified lifetime undisturbed competent capable of being trusted efficient capable qualified able shrewd practical realistic cool-headed lodged in one's brain closely controlled strictly controlled rigidly enforced flawless perfect matter-of-fact down-to-earth affirmed livelong out to fixed upon anxious to committed to intending to fixed on obsessed with resolved on impatient to decisive about determined on muscular well balanced well-built well-balanced lifetime's world-weary unperturbed on the up and up remove secured attested downright outright set firm hard-edged compacted packed hard-handed compact impenetrable consolidated compressed glaring stressed important pointed sober accented iron-clad all-time for life lacking sentiment peaceful recollected untroubled coolheaded serene limpid equal unworried tranquil sedate together placid self-composed smooth for all your life one hundred per cent as hard as nails toughened by experience no mistake copper-bottomed unalarmed for a face univocal black-and-white well-marked minute forthright graphic pronounced full clean-cut distinguishable noteworthy audible visible tangible undubitable silhouetted vivid well-grounded at peace without loopholes black and white as plain as daylight clearly defined cut and dried crystal clear not vague as plain as the nose on your face

Adjective

Not able to be changed or adapted
rigid rigorous stern severe firm stringent uncompromising harsh intransigent strict unrelenting unyielding adamant fixed set austere immutable steadfast authoritarian bound brassbound concrete exact exacting hard immovable inflexible irreversible obdurate resolute tough unalterable unbending unchangeable undeviating unshakeable unswerving unwavering determined incompliant invariable ramrod static unadaptable unchanging unpermissive unvarying bullheaded changeless definite inexorable unmoving cast-iron hard-and-fast hard-line heavy-handed locked in dead set cut-and-dried hard and fast set in stone writ in stone decided upon single-minded strait-laced stubborn obstinate dogged relentless implacable tenacious pigheaded pertinacious hard-nosed adamantine headstrong hardheaded hardened stiff stiff-necked mulish opinionated perverse willful intractable self-willed wilful ossified inconvincible indurate pat self-opinionated solid persistent grim steady cruel stable draconian unflinching unshakable staunch steely unsparing ruthless strong pitiless merciless established remorseless persevering forceful refractory unpersuadable constant tight hardline flinty oppressive stony unmovable iron-willed rooted settled unforgiving extreme entrenched diehard fast unsympathetic recalcitrant ironclad bloody-minded iron resolved hard-core brutal iron-fisted illiberal fierce callous sturdy frozen unbendable contumacious cussed unmalleable unfaltering unreasonable vigorous bull-headed cantankerous balky hard-hearted unfeeling strong-willed hard-boiled incommutable die-hard rugged dead set on inalterable rough permanent dyed-in-the-wool immobile demanding no-nonsense serious uniform uncompliant enduring heartless deep-rooted radical uncooperative inhuman inveterate grave strong-minded stationary savage unmerciful unbreakable secure unappeasable uncharitable set in one's ways unfluctuating binding intolerant dour abiding dogmatic unmodifiable deep-seated unmanageable stalwart hidebound committed solemn lusty ornery purposeful decided indomitable insensitive bolshie resistant still drastic unsmiling final hearty determinate earnest dedicated unpitying ferocious robust nonmoving picky indefatigable winner-take-all zero-sum tyrannical narrow-minded immotile disciplined assertive consistent regular bold stony-hearted confirmed hard as nails ingrained riveted long-standing pig-headed irremovable anchored inhumane perpetual aggressive stout durable devoted locked zealous sedate staid even brick-wall all-or-nothing win-or-lose onerous unswayable barbarous unvaried despotic humourless humorless sober fanatical contrary lasting unfailing invariant uncomic rock-ribbed defiant inexpugnable sobersided froward flat unflagging punishing case-hardened sadistic stuck unemotional not giving an inch certain cold-blooded difficult uncaring closed-minded sure tireless same confining by the book weighty intent astringent sustained impenetrable doctrinaire forbidding mean absolute unabated cross-grained unremitting ordered unbudging equable hanging tough fossilized cut-throat nonmotile hard-bitten hardhanded hardhearted po-faced stubborn as a mule deep-dyed emphatic rebellious stabile insubordinate disciplinary deaf to reason bound and determined incontrovertible deep uptight stuffy untoward faithful bred-in-the-bone intrenched mule devout fossilised restive cold unbudgeable immobilized bitter explicit moored hitched predictable immoderate insistent untiring brutish hooked attached heavy compassionless unshaken unaccommodating soulless monolithic affectless unsentimental imperious nailed overbearing ironhearted stoney stonyhearted desperate systematic pachydermatous indurated excessive murderous insensate punitive desensitized hardy unrelieved trying dire toughened assiduous monotonous hard-headed sedulous hard to please true-blue inured driven undiversified habitual ineradicable militant unchanged hard-hitting true reliable unkind autocratic made fast truculent energetic tyrannous ageless level unmoved stroppy thick-skinned slash-and-burn take-no-prisoners cutthroat standing pat opinionative bloodthirsty businesslike desensitised domineering ardent contrarious dictatorial decisive well-set immobilised feisty vindictive stand pat critical unqualified wrong-headed dug in dog-eat-dog never-failing go-getting solid as a rock pass-fail high stakes clear-cut shortsighted blind deaf regimented incontestable high-stake puritanical controlled petrified stiffened noncompliant renitent spartan fastened Draconian awkward bony immalleable rigidified non-compliant jammed immotive ironhanded scrupulous meticulous painstaking closely controlled strictly controlled rigidly enforced reactionary traditionalist conservative punitory loyal ungiving unstoppable poignant valid powerful convincing compelling acrimonious drawing remove close-minded braced heady violent tormenting maleficent wolfish torturous barbaric ultra-conservative unprogressive regimental jelled unflappable impassive convinced eternal formal cool pounding mortal unimpressionable biased embedded lacking compassion with a heart of stone cold-hearted unimpressible dependable set-on one-sided abusive disciplinarian ascetical pressing browbeating formidable ascetic preconceived unflexible crisp tough nut stick to guns set in concrete quiescent unitary undifferentiated unplacatable iron-handed unmollifiable inescapable unpacifiable cold fish proof against persuasion impertinent bullhead unrepentant uncompassionate pugnacious suppressive fixed as the laws of the Medes and the Persians not changeable obscene pornographic X-rated reserved indelible sacrosanct well-established snug clenched tightened clinched focused hurtful monstrous coldhearted vengeful bestial by the numbers two-fisted with one's feet dug in with one's toes dug in steel calm unfriendly chilly frigid icy frosty do or die hold one's ground hold the fort sticking to one's guns standing one's ground hold the line independent vicious forcible virulent ineluctable uninterrupted continuous complex rule-bound hard-shelled distant aloof well grounded blimpish implanted good down-the-line trusty pious stanch cynical agreed unwaivering hard-shell thick long-lived staying put secured like death and taxes mean business no going back necessary hell bent on compulsory louring gruff unabating monomaniacal never-ending interminable ceaseless incessant continuing unceasing hellbent obsessed continual non-stop arranged preset complicated grounded firmly established obsessive remote lowering intimidating predetermined allotted specified prearranged imperishable unfading unquestionable absolutist irrevocable defined decreed precise prescribed hell-bent on bent on bent upon full of determination focussed do-or-die hell-bent hell-bent upon out rock hard shrewd practical realistic sombre somber ungentle tactless based on deeply felt fogyish stick-in-the-mud conformist planned express bureaucratic officious involved fitted clasped lodged never-changing matter-of-fact down-to-earth allegiant intense wholehearted liege unquestioning tried-and-true trustworthy mean-looking fixed as the laws of the Medes and Persians high-handed unblinking authoritative world-weary definitive stipulated stated inconsiderate thoughtless undaunted in the bag not subject to change hard-edged compacted packed hard-handed compact rocky concentrated consolidated compressed inept undiplomatic bungling similar lacking sentiment not changing gutsy identical matching equivalent as hard as nails as tough as old boots toughened by experience OTT overstrict coercive non-variable non-relative gritty unamenable fussy equal homogeneous resilient ambitious enterprising straight fated orderly fateful well-proportioned plumb well-balanced in black and white symmetrical unbroken consonant incorrigible of a piece normal compatible methodical smooth fastidious boorish argumentative finicky hungry over the top eager keen competitive motivated oafish bearish irascible troublesome discontented dissatisfied fractious obstreperous avid spirited confident thirsty desirous diligent active enthusiastic aspiring dynamic burdensome nasty grievous searing excruciating repressive fiery leathery hard-wearing substantial sound seasoned quiet situated located irritable tiresome vexed testy choosy captious snappy temperamental chippy quarrelsome disputative hypercritical prickly querulous thrawn huffy negative delicate overcritical obstructive particular over-particular ungracious grumbly disobliging importunate finical unpredictable hard to handle invidious fiendish sensitive ill-natured crotchety uppity touchy sour rude crabby hard to satisfy irritating impolite disputatious perfectionist inspired progressive pioneering pushy industrious assured burning unquenchable furious granite indestructible warlike gladiatorial scrappy motionless fit strapping brawny steeled molded mighty cohesive moulded dense healthy conditioned inert self-asserting full-blooded intensely competitive in-your-face self-seeking goal-oriented fiercely competitive get up and go stop at nothing power-hungry having killer instinct self-assertive self-starting self-driven hang-tough high-pressure go for broke self-assured can-do eager beaver power-loving gung ho high-reaching self-possessed self-confident hard-driving heavy-duty well built withstanding long-lasting stock-still stopped categorical inactive halted made to last wanton tough as nails stagnant standing parked unstirring at a standstill lifeless at rest inanimate mean machine having a killer instinct uncalled-for gridlocked not moving rooted to the spot like a statue standing still latent sticky format not moving a muscle deadlocked stalled passive

Noun

A puzzling situation or problem
puzzler challenge mystery abstruseness charade chiller cliffhanger conundrum crux cryptogram difficulty enigma grabber inscrutability mystification occult oracle perplexity poser problem puzzle puzzlement question rebus riddle rune secrecy sphinx stickler stumper subtlety teaser thriller twister whodunit why brainteaser braintwister closed book inscrutableness mindboggler sixty-four-thousand-dollar question brain-teaser dilemma paradox head-scratcher mind-boggler unsolved problem sixty-four dollar question secret complexity quandary knotty problem bewilderment mind-twister toughie facer cruncher abstrusity knotty question snarl awkward problem difficult question roun vexed question tough one intricacy brain-twister question mark complication tough proposition how-do-you-do can of worms hard nut to crack fix involvement obscurity inextricability uphill obfuscation koan entanglement distraction embarrassment Chinese puzzle maze doubt strait predicament confusion plight labyrinth sticker knot parable a closed book Gordian knot difficult proposition convolution imbroglio complicacy tangle web chaos trickiness complexness complicatedness knottiness mess morass net muddle mesh disarray twist mire skein jungle tortuousness quagmire convolutedness inexplicableness mystique turn magic depth mysteriousness profundity incomprehensibility esotericism vagueness jumble mishmash hash medley assortment clutter mixture sophistication collage agglomeration miscellany patchwork hodgepodge variety mélange smorgasbord network potpourri reconditeness arcaneness deepness occultness motley montage miscellanea hardness intricateness motley collection mixed bag bundle mass patchwork quilt mash-up weave awkwardness difficultness elaborateness involution involvedness

Trái nghĩa của tough nut to crack

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