efficacious
/ˌɛfɪˈkeɪʃəs
/adjective formal
(Of something inanimate or abstract) successful in producing a desired or intended result; effective: this treatment was efficacious in some cases...
- 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.
Derivatives
efficaciously
/ adverb ...- 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 ...- 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.
Origin
Early 16th century: from Latin efficax, efficac- (from efficere 'accomplish': see effect) + -ious.