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Antonyms for efficacy

Grammar : Noun
Spell : ef-i-kuh-see
Phonetic Transcription : ˈɛf ɪ kə si


Definition of efficacy

Origin :
  • 1520s, from Latin efficacia "efficacy, efficiency," from efficax (genitive efficacis) "powerful, effective," from stem of efficere "work out, accomplish" (see effect). Earlier in same sense was efficace (c.1200), from Old French eficace (14c.), from Latin efficacia; also efficacite (early 15c.), from Latin efficacitatem.
  • noun efficiency; productiveness
Example sentences :
  • Much has been said concerning the efficacy of the Water Fly as a lure.
  • Extract from : « Punchinello, Vol. 1, No. 6, May 7, 1870 » by Various
  • A few tears mingled with the draught, and perhaps gave it all its efficacy.
  • Extract from : « The Man of Adamant » by Nathaniel Hawthorne
  • He no more believes in the efficacy of soap than in the efficacy of a good reputation.
  • Extract from : « The Book of Khalid » by Ameen Rihani
  • All races have uttered this prayer, apparently with a firm belief in its efficacy.
  • Extract from : « Sex=The Unknown Quantity » by Ali Nomad
  • Day by day her faith in the efficacy of her petitions had grown upon her.
  • Extract from : « Tess of the Storm Country » by Grace Miller White
  • This he readily accepted, trusting to the efficacy of the antidote.
  • Extract from : « Myths and Legends of Ancient Greece and Rome » by E.M. Berens
  • This proved fortunate, for the better testing of the efficacy of the system.
  • Extract from : « Chambers's Edinburgh Journal, No. 453 » by Various
  • Did he ever offer you the support of his vows, or did he ever praise the efficacy of his holiness?
  • Extract from : « The Buddha » by Paul Carus
  • The oak, for instance, has not the efficacy of the fir, nor the cypress that of the elm.
  • Extract from : « Ten Books on Architecture » by Vitruvius
  • He himself had had occasion enough to note the efficacy of that vehicle.
  • Extract from : « Romola » by George Eliot

Synonyms for efficacy

Based on : Thesaurus.com - Gutenberg.org - Dictionary.com - Random House Unabridged Dictionary, © Random House, Inc. 2019