Adjective: efficacious ,e-fu'key-shus
- Marked by qualities giving the power to produce an intended effect
"written propaganda is less efficacious than the habits and prejudices … of the readers"; "the medicine is efficacious in stopping a cough"
- Producing or capable of producing an intended result or having a striking effect
"an efficacious law";
- effective, effectual
See also: effective, effectiveness, effectivity, effectuality, effectualness, efficaciousness, efficacy, efficient, hard-hitting, impelling, impressive, potent, powerful, rough-and-ready, stiff, strong, telling, trenchant, useful, utile
Antonym: inefficacious
Encyclopedia: Efficacious