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Opposite words of efficiency
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question mark, pile, question
clock, symbol
reading, learning, information
energy
bulb, light, idea
design, bellhop, uniform

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Antonyms for Efficiency. (2016). Retrieved 2020, February 29, from https://thesaurus.plus/antonyms/efficiency
Antonyms for Efficiency. N.p., 2016. Web. 29 Feb. 2020. <https://thesaurus.plus/antonyms/efficiency>.
Antonyms for Efficiency. 2016. Accessed February 29, 2020. https://thesaurus.plus/antonyms/efficiency.