Synonyms of efficacy

1 Syllable

strength, weight, might

2 Syllables

success, force, powers, o's, virtue, effect, vigor, use, power

3 Syllables

strenuousness, energies, energy, lustiness, sprightliness, potency, influence

4 Syllables

genuineness, capableness, utility, forcibleness, performance, qualifiedness, adequacy, ability, validity, get-up-and-go, competence, utilities, effectualness, capacity, sufficiency, efficiency, efficiencies

5 Syllables

capability, efficaciousness, capabilities, advantageousness, effectuality, effectiveness