Synonyms|1.1kAntonyms|378|Broader|19Narrower|26Related|2.4k
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bats in the belfry(expression, idiom, calm, sound)
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befuddle
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berserk
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beyond all reason(expression, idiom, reasonable, sensible)
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birdbrained
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blind drunk
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boneheaded
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bughouse
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careless(adjective, stupid, illogical)
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casuistic
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certifiable
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chimerical
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choppy
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chuckleheaded
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cockamamie
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cockamamy
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comical
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concerned
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confused(adjective, careless, stupid, illogical)
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crackbrained
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ChicagoSmart Define. 2016. "rational thesaurus" https://smartdefine.org/rational/thesaurus/antonyms (accessed September 23, 2026).
HarvardSmart Define 2016, rational thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/rational/thesaurus/antonyms>.
MLASmart Define. "rational thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/rational/thesaurus/antonyms>