Definition of efficacious in English:

efficacious

Syllabification: ef·fi·ca·cious
Pronunciation: /ˌefəˈkāSHəs
 
/

adjective

formal
(Typically of something inanimate or abstract) successful in producing a desired or intended result; effective: the vaccine has proved both efficacious and safe
More example sentences
  • During this era, biological discovery is accelerating, resulting in the development of safer and more efficacious drugs.
  • It may not mean that the ultimate result is not efficacious.
  • Both drugs were equally efficacious in improving auditory hallucinations and suspiciousness.
Synonyms

Origin

early 16th century: from Latin efficax, efficac- (from efficere 'accomplish': see effect) + -ious.

Derivatives

efficaciously

adverb
More example sentences
  • The efforts were directed at acquainting students with HIV and risk, encouraging them to assess their individual risk, and then teaching them how to efficaciously reduce or avoid that risk.
  • The police may permit individuals to donate DNA samples at their local laboratory, thereby maximizing compliance and assuring that the procedures are conducted safely and efficaciously.
  • Some of these interpretations suggest that the new laws may not efficaciously exclude appeals based on natural justice.

efficaciousness

noun
More example sentences
  • Where he differs is in his claims about power and its alleged efficaciousness in bringing about ‘knowledge’.
  • Obviously some weapon systems are more effective than others, but the efficaciousness of air defence measures depend basically on the gap between the technological/industrial investment and output of the competing sides.
  • Stating that the first big downpour is usually a test to check the efficaciousness of the drainage system, he said it had helped the department to gauge the problem areas in the city.

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Pronunciation: wiːn
verb
be of the opinion; think or suppose