Ineffective synonyms such as failed, abortive, and bootless. Ineffective is an adjective, and its antonyms are effective and efficient. Additionally, here are 35 synonyms, related words, and verbs for ineffective.
abortive, bootless, failed, feeble, fruitless, futile, hopeless, idle, impotent, inadequate, incapable, incompetent, ineffectual, inefficacious, inefficient, inept, inutile, lame, non-successful, poor, powerless, profitless, purposeless, to no effect, unavailing, unfit, unfructuous, unproductive, unprofitable, unsuccessful, useless, vain, weak, and worthless.