Synonyms|46Antonyms|0|Broader|0Narrower|0Related|1
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batty(adjective, sane)
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bonkers(adjective, sane)
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buggy(adjective, sane)
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cracked(adjective, sane)
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cuckoo(adjective, sane)
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daffy(adjective, sane)
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daft(adjective, sane)
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demented(adjective, sane)
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disordered(adjective, sane)
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fruity(adjective, sane)
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gaga(adjective, sane)
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insane(adjective, sane)
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loony(adjective, sane)
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lunatic(adjective, sane)
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mad(adjective, sane)
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maniacal(adjective, sane)
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non compos mentis(adjective, law, sane)
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nuts(adjective, sane)
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nutty(adjective, sane)
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nutty as fruitcake(expression, sick, hacked, lunatic, crackbrained)
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APASmart Define. (2011). sick in the head thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/sick_in_the_head/thesaurus/synonyms
ChicagoSmart Define. 2011. "sick in the head thesaurus" https://smartdefine.org/sick_in_the_head/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2011, sick in the head thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/sick_in_the_head/thesaurus/synonyms>.
MLASmart Define. "sick in the head thesaurus" 23 May 2011. Web. 29 September 2026. <https://smartdefine.org/sick_in_the_head/thesaurus/synonyms>