1. efficacy
Power is the most general term of this group, including every quality, property, or faculty by which any change, effect, or result is, or may be, produced; as, the power of the legislature to e
Synonyms: power, ability, competency, expertness, readiness, aptitude, dexterity, faculty, skill, capability, efficacy, force, strength, capacity, efficiency, might, susceptibility, cleverness, energy, qualification, talent, cogency
Antonyms: awkwardness, helplessness, inability, incompetence, stupidity, dulness, imbecility, inaptitude, inefficiency, unskilfulness, feebleness, impotence, incapacity, maladroitness, weakness
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Synonyms for efficacy 
