Synonyms to inefficacious

abortive, barren, bootless, failed, failing, fruitless, futile, gainless, immature, ineffective, ineffectual, lame, manque, miscarried, miscarrying, nonremunerative, of no effect, otiose, profitless, rewardless, sterile, stickit, stillborn, successless, unavailable, unavailing, unformed, unfortunate, unmatured, unproductive, unprofitable, unremunerative, unrewarding, unripe, unsuccessful, useless, vain, effete, ablated, all in, anemic, arid, asthenic, ausgespielt, blah, blank, bleary, bloodless, burned-out, burnt up, characterless, chicken, cold, colorless, coming apart, consumed, counterproductive, cowardly, cracking, crumbling, dead, debilitated, decadent, decayed, decaying, declining, degenerate, depleted, deteriorating, devitalized, disabled, disintegrating, dismal, dissipated, dissolute, done, done in, done up, draggy, drained, draining, drearisome, dreary, drooping, droopy, dry, dryasdust, dull, dusty, dwindling, eaten up, ebbing, elephantine, emptied, empty, enervated, enfeebled, eroded, etiolated, eviscerated, exhausted, fade, fading, faint, faintish, falling, far-gon