1. (adj) ineffective, uneffective, ineffectual
not producing an intended effect
Synonyms: unavailing, otiose, unable, inefficient, uneffective, ineffective, futile, ineffectual
Antonyms: useful, potent, stiff, utile, strong
2. (adj) futile, ineffectual, otiose, unavailing
producing no result or effect
Synonyms: senseless, ineffectual, bootless, work-shy, otiose, vain, purposeless, slothful, superfluous, unavailing, sleeveless, indolent, futile, uneffective, faineant, pointless, wasted, unable, lazy, ineffective, fruitless
Antonyms: stiff, strong, potent, useful, utile
3. (adj) ineffective, ineffectual, unable
lacking in power or forcefulness
Synonyms: unavailing, otiose, unable, inefficient, uneffective, ineffective, futile, unable(p), ineffectual
Antonyms: strong, potent, stiff, useful, utile
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Synonyms and Antonyms of ineffectual 
