efficacious

ef·fi·ca·cious

adj \ˌe-fə-ˈkā-shəs\

Definition of EFFICACIOUS

: having the power to produce a desired effect <an efficacious remedy>

— ef·fi·ca·cious·ly adverb

— ef·fi·ca·cious·ness noun

Examples of EFFICACIOUS

1. <taking a cookie break while studying is one of the most efficacious ways of rejuvenating the mind that I have ever discovered>

Origin of EFFICACIOUS

Latin efficac-, efficax, from efficere

First Known Use: 1528

Related to EFFICACIOUS

Synonyms: effectual, effective, efficient, fruitful, operative, potent, productive

Antonyms: fruitless, ineffective, ineffectual, inefficient, inoperative, unfruitful, unproductive, useless

Related Words: hyperefficient, ultraefficient; adequate, capable, competent; accomplished, adept, consummate, experienced, expert, masterly, practiced (also practised), proficient, skilled, skillful, versed, veteran, virtuoso; cogent, convincing, killer, sound, striking, telling, valid; active, dynamic; useful, working; applicable, feasible, functional, practicable, practical, realizable, usable (also useable), workable

Near Antonyms: counterproductive; incapable, incompetent, inexperienced, inexpert, unqualified, unseasoned, unskilled, unskillful; abortive, bootless, futile, vain; empty, hollow, idle, pointless, unavailing, unprofitable, unsuccessful; inoperative, worthless

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See Synonym Discussion at effective

Rhymes with EFFICACIOUS

arenaceous, carbonaceous, contumacious, disputatious, farinaceous, foliaceous, gallinaceous, orchidaceous, ostentatious, perspicacious, pertinacious, solanaceous, violaceous