efficacious[adjective]Synonyms: effective, adequate, efficient, operative, potent, powerful, productive, successful, useful
Antonyms: inefficacious
Contrasted words: abortive, impotent, powerless, useless, vain, weak
Related Words: active,
operative,
productive,
influential,
potent,
powerful,
puissant,
strong [TahlilGaran] English Synonym Dictionary ▲
ef‧fi‧ca‧cious /ˌefəˈkeɪʃəs◂, ˌefɪˈkeɪʃəs◂/
adjective formal[
Date: 1500-1600;
Language: Latin;
Origin: efficax, from efficere; ⇒ effect1]
working in the way you intended
Synonym : effective:
an equally efficacious method of treatment [TahlilGaran] Dictionary of Contemporary English ▲