Synonyms|437Antonyms|116|Broader|0Narrower|0Related|368
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imbecilic
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immoderate
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implausible
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impulsive
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inane
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incautious(adjective, careless, unsound)
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incongruous
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indiscreet(adjective, careless, unsound)
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infantile
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inordinate
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insensate
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invalid
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irresponsible
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jumpy
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loopy
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ludicrous
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lunatic
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madcap
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manic
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misguided
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APASmart Define. (2015). levelheaded thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/levelheaded/thesaurus/antonyms
ChicagoSmart Define. 2015. "levelheaded thesaurus" https://smartdefine.org/levelheaded/thesaurus/antonyms (accessed September 21, 2026).
HarvardSmart Define 2015, levelheaded thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/levelheaded/thesaurus/antonyms>.
MLASmart Define. "levelheaded thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/levelheaded/thesaurus/antonyms>