Synonyms|391Antonyms|160|Broader|4Narrower|7Related|1k
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consummate
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crackerjack
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dearth
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deficiency
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deficit
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deprivation
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dexterous(adjective, sound, competent)
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diligent
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discounted
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downright
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educated
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encyclopedic
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enforceable
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entire
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experienced
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familiar with(expression, weak, delicate, inadequate)
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fertile
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fireball
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fit(adjective, sound, competent)
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functional
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APASmart Define. (2015). inefficient thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/inefficient/thesaurus/antonyms
ChicagoSmart Define. 2015. "inefficient thesaurus" https://smartdefine.org/inefficient/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2015, inefficient thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/inefficient/thesaurus/antonyms>.
MLASmart Define. "inefficient thesaurus" 12 November 2015. Web. 24 September 2026. <https://smartdefine.org/inefficient/thesaurus/antonyms>