Inefficacy antonyms

What is the opposite word for Inefficacy?

Antonyms for inefficacy
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Antonyms for Inefficacy. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/antonyms/inefficacy
Antonyms for Inefficacy. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/antonyms/inefficacy>.
Antonyms for Inefficacy. 2016. Accessed August 16, 2026. https://thesaurus.plus/antonyms/inefficacy.