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hard difficult arduous tough demanding exacting laborious strenuous challenging gruelling formidable grueling heavy testing toilsome rigorous uphill backbreaking rough severe taxing herculean stiff murderous moiling onerous hellacious tall rugged trying killer sweaty Augean laboured labored oppressive strained pick-and-shovel punishing exhausting burdensome tiring back-breaking fatiguing harsh Herculean wearying killing knackering wearisome operose brutal stressful exigent excruciating grinding fierce hellish torturous wearing troublesome crushing ponderous tortuous tiresome draining toilful painful sapping tedious energy-consuming daunting weighty bruising grievous debilitating no picnic ambitious stringent agonizing vigorous harrowing hairy bothersome unremitting unsparing unbearable agonising tough going painstaking persnickety relentless grim colossal forbidding thorny extreme shattering depleting unforgiving mighty intense mean galling unpleasant irksome intolerable wicked cumbersome staggering upstream intimidating unyielding gargantuan uncomfortable serious titanic slavish difficile really hard very hard tricky immoderate steep murder impossible hefty boring enervating crippling merciless imperious distressing jarring solemn distressful worksome backbreaker prohibitive immense gigantic cruel physical unreasonable prodigious searching exorbitant excessive stretching Sisyphean overwhelming unfair monumental unrelaxing mammoth unrelenting withering austere dour no piece of cake thoroughgoing dogged hectic busy hypercritical thorough precise critical careful nit-picking spartan despotic domineering protracted lengthy hardworking slow major knotty contrived awkward artificial leaden tortured clumsy very difficult wretched exerting bad bitter hardhanded inhuman searing by the book large order heavy sledding unjust drastic dicey awful hazardous easier said than done nerve-racking high-impact torturesome unendurable hard-won drudgy vicious marathon troubling unnerving high-pressure problem ominous insufferable sticky tormenting not easy like getting blood out of a stone ferocious almighty savage scabrous problematic uphill battle discomforting forced affected overdone studied racking chastening inept unnatural overwrought maladroit pressing time-consuming disturbing disagreeable worrying upsetting vexing hostile worrisome nasty disquieting traumatic dire inconvenient vexatious fraught bleak agitating annoying terrible depressing unsettling unfavourable foreboding sinister threatening grave unfavorable aggravating irritating disconcerting discouraging adverse gloomy frightening hurtful enervative nagging dark strict unfortunate perturbing dismaying dreadful troublous dangerous disruptive dismal provoking harassing alarming miserable discomposing frustrating pressured disadvantageous consequential tense exasperating violent frightful discommoding embarrassing startling harmful perplexing woeful intrusive impeding injurious aggressive sad damaging calamitous disastrous turbulent regrettable horrible anxious tragic horrendous wild impressive unlucky heartbreaking inhospitable unfriendly stark rotten ghastly weary comfortless intractable foul vile creepy energetic hopeless rowdy heartrending desolate detrimental inauspicious black unwelcome pessimistic ruinous prophetic uncertain unpropitious destructive ugly inimical menacing bold chaotic afflictive inopportune poor stormy grandiose daring horrid straitened heart-rending industrious fractious unkind unruly extravagant lamentable lofty appalling tumultuous undisciplined disorderly atrocious abominable riotous intemperate inclement unpromising unmanageable restless superincumbent untoward horrifying afflicting displeasing intensive cheerless pestilent drudging distasteful unpalatable importunate lousy uneasy confronting cataclysmic flustering sombre large-scale deleterious disheartening catastrophic pernicious noxious bumpy joyless objectionable negative ruthless tragical chilling a stinker of a doleful nocuous somber troubled baneful unhealthy unwholesome anxiety-ridden deadly morose glum gray grey nightmarish morbid perilous messy prejudicial malefic malignant ill-fated undesirable mournful precarious huge massive rumbustious prostrating powerful responsible punitive inexorable heart-pumping forceful heroic courageous Spartan bare-bones barren overburdening a nuisance uncharitable an imposition nail-biting nervous nerve-wracking embittering overtaxing overpowering plodding headache shocking disappointing carking horrific tight tempestuous revolting loathsome diligent niggling maddening infuriating execrable gruesome complex complicated profound confused concentrated abstruse te recondite fearsome plaguy pestiferous concerning pestilential grisly macabre terrifying unwelcoming pesky unsettled monstrous grotty charged pitiless oppressed impoverished poverty-stricken infestive ungovernable repressive sobering big considerable peracute significant life-threatening acute audacious beastly tickly discomfiting heightened frantic untimely hair-raising dreary grand elaborate intrepid prickly dolorous from hell poignant active eventful frenzied frenetic lively undermining unsafe insidious lethal incendiary imperilling toxic subversive malicious imperiling unrealistic pretentious visionary itchy incommodious distressed scratchy unadvantageous deplorable causing discomfort ill-fitting yukky unhappy sour yucky uncongenial unlovely unpleasing unsavory magnificent cursed jinxed improbable ballsy brash idealistic unfeasible icky sore remorseless mortifying great cataclysmal fatal fanciful unreal full of problems beset by problems unsavoury offensive boisterous troublemaking hard-pressed lurid shadowy discommodious full of hardship doubtful ill-omened treacherous direful ill-boding parlous jeopardous apocalyptic rocky very bad animated madhouse tireless full furious bustling a bummer of a unlikely devastating damning uninviting gut-wrenching full on spirited action-packed raucous belligerent contumacious lawbreaking thuggish pugnacious unrestrained ill-timed infelicitous catastrophal far-fetched chill dreich murky sunless forlorn disconsolate drab darkening plutonian portentous lugubrious sullen tenebrous godforsaken saturnine drear lonesome depressive Cimmerian tenebrific elegiac cold sepulchral funereal lonely elegiacal cloudy evil two-fisted anarchic lawless fateful hard-hearted difficult to achieve melancholy radge too bad cancerous malign maleficent poisonous mischievous baleful iniquitous cantankerous reprobate nocent ill uncompromising perfectionist clamorous judgmental obstinate disapproving fussy dictatorial overbearing inflexible overexacting unamenable unaccommodating querulous insistent cavilling unbending hardheaded quibbling disparaging obdurate needy possessive hairsplitting caviling firm sticklerish faultfinding overscrupulous censuring cavillous stubborn unflinching demeaning cynical tyrannical carping censorious high-maintenance over-rigorous hard-line over-strict hard to please over-exacting fault-finding hard to satisfy over-censorious over-particular

knotty complex complicated intricate difficult hard involved baffling convoluted tangled thorny tricky troublesome awkward mystifying perplexing Byzantine involute problematic puzzling taxing tortuous baroque byzantine complicate daedal elaborate insoluble labyrinthian labyrinthine obscure sophisticated unanswerable unfathomable impenetrable involuted problematical formidable Gordian mazy ramified reticular terrible uphill bewildering confusing entangled confused abstruse enigmatic Daedalian detailed cryptic serpentine fancy recondite inscrutable mysterious undecipherable difficult to understand fiddly incomprehensible jumbled inexplicable inextricable paradoxical mixed up mind-bending esoteric ticklish winding unaccountable mixed ravelled challenging raveled wildering confounding tough interlaced unclear beyond one ambiguous deep messy opaque mixed-up full of twists and turns hard to understand devious disconcerting worrying maze-like circuitous multifarious variegated heterogeneous hidden concealed impossible spiny dark advanced muddled cumbersome drawn-out long-drawn-out high-tech dense knotted multifaceted fathomless refined bamboozling surprising oracular Daedalean hi-tech gnarly enigmatical mystical scrambled chaotic plotty long-winded mazelike arduous intertwined interwoven labyrinthial labyrinthical labyrinthal labyrinthiform labyrinthic indivisible inseparable subtle weird strange composite compounded miscellaneous multiplex mosaic mingled multiple manifold multiform conglomerate motley compound frustrating bemusing delicate insolvable hairy beyond you full of surprises problem funny peculiar odd trying fiendish kittle devilish clever gimmicky new befuddling oblique indissoluble impossible to separate very devil of a devil of a unintelligible abstract hard to follow inaccessible mind-boggling above one's head hard to solve profound vexing beyond comprehension rambling beyond one's grasp unsolvable hard to explain hazy thought-provoking over one's head weighty murky serious secret uncanny heavy veiled thorough clandestine untold particularized painstaking shadowy extensive full particular studied covert shrouded as clear as mud laboured exact precise perfected careful minute skillful prodigious labored circumstantial skilful imposing gingerbread clouded cloaked secretive overworked particularised many-faceted overdone arcane unrevealed anagogic mystic occult cloak-and-dagger black Delphic recherché highly wrought high tech cabalistic blow-by-blow nebulous sinuous twisted ornate rococo nuanced can of worms meticulous exhaustive complete comprehensive in-depth accurate specific scrupulous explicit rigorous close sweeping itemized all-inclusive fine methodical all-embracing demanding intensive encyclopedic itemised exquisite encyclopaedic elaborated radical seriatim punctilious thoroughgoing strict fastidious searching systematic sedulous total dainty all-encompassing widespread strenuous nice finicky hairsplitting definite layered inordinate state-of-the-art drastic developed faithful selective enumerated extreme revolutionary intrinsic topical in depth point-by-point daunting operose profuse abundant plentiful lavish rich copious ample stage by stage step by step at length major appropriate actual liberal sufficient elite personal immediate perfect experienced satisfying concentrated intense elegant finical faultless exclusive high-level higher-level in detail broad-ranging firsthand direct penetrating all-out concerted fine-drawn persnickety superior finicking orderly finespun nifty top-level absolute essential elemental vigorous all-absorbing ultra-fine hairline dead on winning unerring incorrupted well-crafted consummate intimate special categorical unqualified critical assiduous conscientious clocklike specialised specialized first-hand explosive heavy-duty violent vehement excruciating vicious fearsome hellacious ghastly high-pressure fierce dreadful determined blistering furious resolute keen acute ferocious almighty fearful frightful well-made well-executed out-and-out persistent accelerated fast severe insistent speeded-up polished compendious cyclopedic efficient embracive panoramic inclusive omnibus universal leaving no stone unturned cover-all all-in broad-gauge broad-gauged

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