Inefficient antonyms

What is the opposite word for Inefficient?

Use filters to view other words, we have 38 antonyms for inefficient.
Antonyms for inefficient
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Definitions of Inefficient
Inefficient Synonyms
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inefficiency, inefficiently
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Opposite words of inefficient
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Antonyms for Inefficient. (2016). Retrieved 2026, August 12, from https://thesaurus.plus./antonyms/inefficient
Antonyms for Inefficient. N.p., 2016. Web. 12 Aug. 2026. <https://thesaurus.plus./antonyms/inefficient>.
Antonyms for Inefficient. 2016. Accessed August 12, 2026. https://thesaurus.plus./antonyms/inefficient.