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efficacious

11 plus vocabulary word for grammar school entrance exams

Difficulty: Difficult

Learn the meaning of efficacious with synonyms, antonyms and an example sentence. Part of our 11 plus vocabulary list used for selective school and grammar school preparation.

efficacious

(adjective)

Meaning

effective in producing a desired result

Example

"The new medicine proved to be highly efficacious in treating the illness."

Synonyms

effectiveusefulbeneficial

Antonyms

ineffectiveuselessinefficient

More about this word

Word origin
From Latin 'efficax', meaning 'accomplishing'