61 entries under expression topic. ×

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in poor health(idiom, false, ill, insane)
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light minded
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low spirits(idiom, madman)
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lymphatic duct
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mental defective(worrier, nutter, valetudinary)
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mental patient
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mentally disabled
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mentally disturbed
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morbid person(worrier, nutter, valetudinary)
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nobody home(unstable, disturbed, unhinged)
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not solid(false, unstable, ill, insane)
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obsessive person(worrier, nutter, valetudinary)
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off his rocker
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out of all reason(idiom, silly, foolish, unwise)
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overenthusiastic person(noun, crazy, loony)
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scatter brained(idiom, insanity)
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shatter brained(idiom, insanity)
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under the influence
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up the Pole
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upside down(verb, phrasal verb)
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APASmart Define. (2015). lunatic thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/lunatic/thesaurus/synonyms
ChicagoSmart Define. 2015. "lunatic thesaurus" https://smartdefine.org/lunatic/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, lunatic thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/lunatic/thesaurus/synonyms>.
MLASmart Define. "lunatic thesaurus" 6 August 2015. Web. 24 September 2026. <https://smartdefine.org/lunatic/thesaurus/synonyms>