Link Centre Dictionary

efficacious

ef·fi·ca·cious

UK/ˌɛf.ɪˈkeɪ.ʃəs/ US/ˌɛf.əˈkeɪ.ʃəs/ uncommon formal

adjective

1.

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”
Antonyms
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2.

producing or capable of producing an intended result or having a striking effect

  • “an air-cooled motor was more effective than a witch”
  • “-LewisMumford;”
  • “;”
  • “;”
  • “;”
  • “;”
Synonyms
Antonyms
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Origin

From Old French efficacieux (whence -acious), from Latin efficāx (“efficacious”) + -ous, from efficere (“to effect, to accomplish”); see effect.

Related words

Word family

See also

WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.