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Efficacious
Opposites of
efficacious
Antonyms for
efficacious
Find the opposite of
futile
incapable
ineffective
ineffectual
inefficacious
inefficient
unavailing
unproductive
unsuccessful
useless
Synonyms for
efficacious
There are 10 opposites of efficacious
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Antonym Dictionary
(Dictionary of opposites)
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