Synonyms of useless

1 Syllable

naught, weak, scrap, worn, vain, null

2 Syllables

stupid, fruitless, thankless, noway, gainless, junked, trashy, pointless, idle, inept, waste, crummier, grotty, nuller, no-go, no-way, crummiest, washed-up, worn-out, idlest, bootless, crappier, feckless, drossy, zipper, beastlier, goner, crummy, trashier, crappy, piddling, worthless, no-good, unfit

3 Syllables

low-ranking, meaningless, profitless, causeless, unneeded, superfluent, futile, acarpous, superfluous, pathetic, doubletalk, discarded, resultless, doublespeak, no-account, unmeaning, valueless, unfitted, hopeless, nonviable

4 Syllables

abortive, expendable, unimportant, uncalled-for, impractical, unsalable, unreturned, dispensable, residuary, unrequired, unreformed, unratified, unworkable, infeasible, dysfunctional, unfunctional, unusuable, purposeless, nongermane, unavailing, unsuccessful, nonfunctional, unpurposed, inutile, ill-equipped, unlikable, inessential, recidivous, impossible, unessential, nugatory, good-for-nothing, unsanctioned, incompetent, ineffectual

5 Syllables

unnegotiable, unnecessary, incorrigible, irremediable, unenforceable, impracticable, irrealizable, uncorrectable, unrealizable, disadvantageous, unavailable, unprofitable, undesirable, irredeemable, commiserable, unproductive, ineffective, inefficacious, unserviceable

6 Syllables

counterproductive, dissatisfactory, inoperative, unbusinesslike

7 Syllables

supererogatory