Đồng nghĩa của slack spined

ineffective unproductive unsuccessful futile useless fruitless ineffectual unprofitable vain unavailing abortive inefficacious profitless bootless non-successful worthless failed feeble idle inadequate inefficient inept pointless purposeless barren empty lame otiose weak inutile unfructuous unfruitful anticlimactic defeasible emasculate forceless indecisive inferior innocuous inoperative limited neutralised neutralized nugatory null paltry spineless unable unavailable void withered to no avail no go not effective no way to no effect valueless in vain impotent hopeless meaningless pathetic to no purpose hollow trivial spiritless unrewarding insignificant sterile trifling thwarted counterproductive senseless of no use poor wishy-washy powerless inconsequential aimless effete good-for-nothing unusable soft foiled impractical tame feckless nerveless unimportant wet vapid weak-kneed doomed invertebrate incompetent unsatisfactory lacklustre lackluster wimpish no-good wimpy Sisyphean cowardly lifeless flat without success frustrated insufficient unpurposed insipid insubstantial weakling chicken no dice puny characterless milk-and-water namby-pamby of no avail petty junky limp-wristed wasted waste miserable timid bungled timorous defeated baulked mediocre unremunerative bland for nought irresolute enervated expendable balked frail weakened no use impracticable yellow-bellied no-account unprolific chaffy half-hearted frivolous not worth the candle on a treadmill wasteful trashy uninspiring wretched unassertive unconvincing boneless cheap craven bogus nothing ignoble abandoned unessential apathetic gutless lily-livered faint-hearted thin misfired unworkable nonfunctional thankless wussy unfunctional disastrous listless sissified sissy hamstrung inexpedient flimsy botched uninspired scrap dysfunctional yellow dull unimpressive lazy exhausted implausible silly pale stillborn measly unimaginative blocked negligible stupid disadvantageous dry forlorn slight piddling needless flabby pants inane unreal delusive irrelevant unsuitable footling banal unreliable etiolated bloodless gainless no good unsubstantial wavering vacillating faltering anemic anaemic lost a dead loss without rhyme or reason abject drossy despicable contemptible base disorganized ne'er-do-well impuissant failing pallid bungling unanimated lustreless muted scant miscarried uneconomic vigourless stymied halfhearted save one's breath null and void unsalable ruined spoiled disorganised unserviceable hindered stonewalled obstructed nonproductive uncreative slow unyieldly motiveless nonpractical cramped frustaneous unlucrative insincere spoilt boring unuseful inoperable broken dead inactive flaccid shallow niggling picayune minute nominal piddly pimping piffling inconsiderable peanut time-wasting stale of no earthly use messed up no-win misleading unnotable shuck delusory for naught limp not useful uninteresting meek weak-willed fickle passive shiftless irresponsible absurd nonsensical off jejune arid tedious commonplace going nowhere dithering spinning one's wheels wild goose chase of no value unneeded resultless not a prayer in vicious circle fouled up dreary drab unstimulating prosaic monotonous humdrum flavourless watered-down flavorless sapless languid helpless impossible non-functioning indeterminate pusillanimous undetermined fallible groundless de minimis Mickey Mouse insane fatuous slothful indolent unlikely transparent vacuous vacant unfilled clear defective deficient chicken-hearted corruptible supine hemming and hawing waffling undependable yielding unsure no good to gundy foolish poxy wanky rubbishy nickel-and-dime purportless unnecessary redundant nongermane not pertinent superfluous half-baked fustian unenterprising reckless unambitious incautious lousy uncareful carefree careless wild baseless ill-fated bleak of no benefit casual easily led weedy not in use out of use silent turned off not working out of service rubbish rambling unfounded unhelpful hard to swallow faulty unpersuasive hard to believe unpleasing beyond remedy unachievable despaired of two a penny not much cop drippy lacking foundation a dime a dozen nerdy daft chicken-livered pigeon-hearted not worth a hill of beans fearful without grounds without foundation not serious poor-spirited candy-assed

slacks up slack up slade slades slag slagged slacks off on slacks off slacks slack off on slack off slacknesses