Synonyms of ineffective

1 Syllable

paled, void, lame, wan, vain, null

2 Syllables

wannest, fruitless, uncool, doughier, doughy, pointless, palest, idle, inept, nuller, wanner, barren, pithless, bootless, feckless, paler, drossy, paltry, worthless, no-good, feeble, unfit, scrapper

3 Syllables

limited, innocuous, withered, powerless, futile, unable, inferior, impotent, resultless, forceless, faint-hearted, useless, unfruitful, slack-spined, no-account, unpleasing, spineless

4 Syllables

abortive, unusable, unsatisfying, unfulfilling, unratified, unfunctional, unusuable, inproficient, unequipped, nongermane, unavailing, improficient, unsuccessful, nonfunctional, defeasible, neutralized, inutile, disappointing, ill-equipped, nugatory, unsanctioned, wishy-washy, incompetent, ineffectual, incapable, inefficient

5 Syllables

unworkmanlike, unenforceable, unavailable, unprofitable, emasculate, unpersuasive, amoebalike, anticlimactic, inadequate, unproductive, indecisive, disenfranchised, inefficacious

6 Syllables

inoperative