| efficacious | (adj) marked by qualities giving the power to produce an intended effect; -Aldous Huxley, Ant. inefficacious, Example: written propaganda is less efficacious than the habits and prejudices...of the readers; the medicine is efficacious in stopping a cough |
| efficaciously | (adv) in an effective manner, Syn. effectively, Ant. ineffectively, inefficaciously, Example: these are real problems that can be dealt with most effectively by rational discussion |
| Efficacious | a. [ L. eficax, -acis, fr. efficere. See Effect, n. ] Possessing the quality of being effective; productive of, or powerful to produce, the effect intended; -- |
| efficaciousness | n. the capacity or power to produce a desired effect. |