142 entries under silly topic. ×

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fruity(foolish, unwise)
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gung ho(expression, adjective, keen, warm)
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keen(adjective, warm, foolish, crazy)
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mad as a March hare(expression, idiom, foolish, unwise)
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mad as a hatter(expression, idiom, foolish, unwise)
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maniacal(foolish, unwise)
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mental(foolish, unwise)
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mentally strange(expression, foolish, unwise)
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moonstruck(foolish, unwise)
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nutty as fruitcake(expression, idiom, foolish, unwise)
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of unsound mind(expression, idiom, foolish, unwise)
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out to lunch(expression, idiom, foolish, unwise)
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psycho(foolish, unwise)
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round the bend(expression, idiom, foolish, unwise)
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schizo(foolish, unwise)
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screw loose(expression, foolish, unwise)
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unglued(foolish, unwise)
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unhinged(foolish, unwise)
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unrealistic(foolish, fantastic, unwise, impractical)
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unzipped(foolish, unwise)
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APASmart Define. (2015). harebrained thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/harebrained/thesaurus/synonyms
ChicagoSmart Define. 2015. "harebrained thesaurus" https://smartdefine.org/harebrained/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, harebrained thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/harebrained/thesaurus/synonyms>.
MLASmart Define. "harebrained thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/harebrained/thesaurus/synonyms>