1. efficacious - Noun
2. efficacious - Adjective
Possessing the quality of being effective; productive of, or powerful to produce, the effect intended; as, an efficacious law.
Source: Webster's dictionaryExample is always more efficacious than precept. Samuel Johnson
It isn't given for us to know those rare moments when people are wide open and the lightest touch can wither or heal. A moment too late and we can never reach them any more in this world. They will not be cured by our most efficacious drugs or slain with our sharpest swords. F. Scott Fitzgerald
Teaching at best beckons us to morality, but it is not in itself efficacious. Teaching is like a mirror. It can show you if your face is dirty, but it the mirror will not wash your face. Ravi Zacharias
I find her anecdotes more efficacious than sheep-counting, rain on a tin roof, or alanol tablets.... you will find me and Morpheus, off in a corner, necking. Dorothy Parker
Wealth, religion, military victory have more rhetorical than efficacious worth. George Santayana
For those impervious to history, only sterilization and quarantine are efficacious. Sheri S. Tepper