efficacious (C1)

adjective

Pronunciation: /ˌɛfɪˈkeɪʃəs/

Definition

Producing the desired or intended result; effective.

Examples

• The new vaccine proved highly efficacious in preventing the spread of the virus.

• For the treatment to be truly efficacious, patients must follow the dosage instructions carefully.

• She sought an efficacious solution to the complex problem, one that would yield lasting results.

Synonyms of efficacious

Words with a similar meaning to efficacious:

• effective
• potent
• successful
• operative

Antonyms of efficacious

Words with the opposite meaning to efficacious:

• ineffective
• futile

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