112 entries under foolish topic. ×

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half-baked(silly, unwise)
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ill-conceived(silly, unwise)
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impracticable(silly, unwise)
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imprudent(silly, unwise)
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irresponsible(silly, unwise)
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low-down(adjective, offensive, rude, stupid)
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lunatic(silly, unwise)
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mad as a March hare(expression, idiom, silly, unwise)
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mad as a hatter(expression, idiom, silly, unwise)
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maniacal(silly, unwise)
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mental(silly, unwise)
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mentally strange(expression, silly, unwise)
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moonstruck(silly, unwise)
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nutty as fruitcake(expression, idiom, silly, unwise)
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of unsound mind(expression, idiom, silly, unwise)
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out of all reason(expression, idiom, silly, unwise)
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out to lunch(expression, idiom, silly, unwise)
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potty(silly, unwise)
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psycho(silly, unwise)
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puerile(silly, unwise)
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APASmart Define. (2016). outlandish thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/outlandish/thesaurus/synonyms
ChicagoSmart Define. 2016. "outlandish thesaurus" https://smartdefine.org/outlandish/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, outlandish thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/outlandish/thesaurus/synonyms>.
MLASmart Define. "outlandish thesaurus" 30 March 2016. Web. 26 September 2026. <https://smartdefine.org/outlandish/thesaurus/synonyms>