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We found one dictionary that defines the word unefficacious:

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  1. unefficacious: Wiktionary

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Definitions from Wiktionary (unefficacious)

▸ adjective:  Not efficacious.

Similar:
nonefficacious, inefficacious, noneffectual, inefficient, uneffectual, ineffective, noneffective, ineffectual, unefficient, uneffective, more...

Opposite:
effective, efficient, productive, successful

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▸ Invented words related to unefficacious

Similar:
nonefficacious, inefficacious, noneffectual, inefficient, uneffectual, ineffective, noneffective, ineffectual, unefficient, uneffective, more...

Opposite:
effective, efficient, productive, successful



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