- adjectiveformalefficacious (adjective)
- (of something inanimate or abstract) successful in producing a desired or intended result; effective:"the vaccine has proved both efficacious and safe"
Originearly 16th century: from Latin efficax, efficac- (from efficere ‘accomplish’: see effect)+ -ious.Similar and Opposite Wordsadjective- (of something inanimate or abstract) successful in producing a desired or intended result; effective:
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