Synonyms of inefficacious
- 1 Syllable
- null, vain, lame, void
- 2 Syllables
- shucker, idle, paltry, inept, barren, fruitless, worthless, feeble, nuller, bootless, feckless
- 3 Syllables
- inferior, impotent, limited, forceless, time-wasting, spineless, useless, futile, innocuous, withered, unfruitful, unable, slack-spined, nonviable, impuissant, powerless
- 4 Syllables
- abortive, unavailing, improficient, nugatory, unnotable, impractical, unsanctioned, unsuccessful, incompetent, defeasible, infeasible, neutralized, inefficient
- 5 Syllables
- unnegotiable, invertebrate, unworkmanlike, unprofitable, inadequate, unproductive, indecisive, ineffective, anticlimactic, unserviceable
- 6 Syllables
- unbusinesslike, inoperative