Efficient antonyms

What is the opposite word for Efficient?

Use filters to view other words, we have 49 antonyms for efficient.
Antonyms for efficient
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Efficient Thesaurus
Definitions of Efficient
Efficient Synonyms
Nearby Words
efficacy, efficiency, efficiently
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Opposite words of efficient
Photo search results for Efficient
Five Bulb Lights Clear Light Bulb Lighted Light Bulb in Selective-focus Photography Anonymous female showing light bulb Unrecognizable woman demonstrating light bulb in hands White Windmill
Image search results for Efficient
question mark, pile, question deadline stopwatch, clock, symbol reading, learning, information energy efficiency, energy, energy class bulb, light, idea design, bellhop, uniform
Cite this Source
Antonyms for Efficient. (2016). Retrieved 2026, July 19, from https://thesaurus.plus/antonyms/efficient
Antonyms for Efficient. N.p., 2016. Web. 19 Jul. 2026. <https://thesaurus.plus/antonyms/efficient>.
Antonyms for Efficient. 2016. Accessed July 19, 2026. https://thesaurus.plus/antonyms/efficient.