EFFICACIOUS

effective, effectual, efficacious

(adjective) producing or capable of producing an intended result or having a striking effect; “an air-cooled motor was more effective than a witch’s broomstick for rapid long-distance transportation”-LewisMumford; “effective teaching methods”; “effective steps toward peace”; “made an effective entrance”; “his complaint proved to be effectual in bringing action”; “an efficacious law”

efficacious

(adjective) marked by qualities giving the power to produce an intended effect; “written propaganda is less efficacious than the habits and prejudices...of the readers”-Aldous Huxley; “the medicine is efficacious in stopping a cough”

Source: WordNet® 3.1

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Etymology

Adjective

efficacious (comparative more efficacious, superlative most efficacious)

(formal) Effective; possessing efficacy. [from 1520s]

Synonym: effective

Antonym: inefficacious

Source: Wiktionary

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Ef`fi*ca"cious, a. Etym: [L. eficax, -acis, fr. efficere. See Effect, n.]

Definition: Possessing the quality of being effective; productive of, or powerful to produce, the effect intended; as, an efficacious law.

Syn.

– See Effectual.

– Ef`fi*ca"cious*ly, adv.

– Ef`fi*ca"cious*ness, n.

Source: Webster’s Unabridged Dictionary 1913 Edition

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