Part of speech:
Producing a strong impression or response; striking:
Producing or sufficient to produce a desired effect.
Producing a desired effect, product, etc. with a minimum of effort, expense, or waste; working well
Producing or capable of producing crops, goods, or services, especially in abundance:
Erupting or liable to erupt; not dormant:
Having ability; able to do things well; skilled; competent
Effective or powerful in action, as a drug or drink
The definition of powerful is having a lot of strength, authority or force.
The definition of useful is helpful or beneficial.
(Archaic) Having potency; efficacious
Not capable of producing a desired effect or result; ineffective.
Not producing the desired effect with a minimum use of energy, time, etc.; ineffective
(Economics) Adding nothing to exchangeable value.
Having no purpose or reason; pointless; to no avail:
Having an unfavorable outcome:
Producing or able to produce a desired effect
Find another word for efficacious. In this page you can discover 22 synonyms, antonyms, idiomatic expressions, and related words for efficacious, like: effective, effectual, efficient, productive, active, capable, forcible, potent, powerful, prevalent and useful.