- capable of having the desired result or effect; effective as a means, measure, remedy, etc.: The medicine is efficacious in stopping a cough.
Origin of efficacious
Related Words for efficaciousnesseffectuality, efficacy, power, influence, success, capability, cogency, effectiveness
Examples from the Web for efficaciousness
Historical Examples of efficaciousness
A single one of its thrusts must equal and often surpass in efficaciousness the repeated wounds of the other.Bramble-bees and Others
J. Henri Fabre
Nothing that we learn could possibly suggest to us the idea of what an influence or efficaciousness is.The Elementary Forms of the Religious Life
A friend of Homœopathy, not a physician, desired to test the efficaciousness of this plant.
- capable of or successful in producing an intended result; effective as a means, remedy, etc