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Inefficacious has 30 synonyms. The top synonyms for inefficacious are abortive, barren, fruitless, futile, impotent, inadequate, inane, ineffective and 22 more. Another word for inefficacious is abortive. Browse the full list below.
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| Random | DefinitionA common synonym for inefficacious is abortive. Other synonyms include barren, fruitless, futile, impotent.
Inefficacious has 30 synonyms listed on Thesaurasize.
(adj): incapable of having the intended consequence; not effective
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