Synonyms|496Antonyms|61|Broader|9Narrower|34Related|108
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inabilities
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incompatibility
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ineffectuality
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ineffectualness
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ineligibility
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insufficiency
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lack(noun, incompetence)
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lapse
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lessening
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plunge
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powerlessness
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relapse
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retreat(noun, lack, incompetence)
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stay
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suspend
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unawareness
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unfamiliarity
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unfitness
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uselessness
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weakness
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APASmart Define. (2015). proficiency thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/proficiency/thesaurus/antonyms
ChicagoSmart Define. 2015. "proficiency thesaurus" https://smartdefine.org/proficiency/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2015, proficiency thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/proficiency/thesaurus/antonyms>.
MLASmart Define. "proficiency thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/proficiency/thesaurus/antonyms>