80 entries under silly topic. ×

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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 of all reason(expression, idiom, foolish, unwise)
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out to lunch(expression, idiom, foolish, unwise)
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potty(foolish, unwise)
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psycho(foolish, unwise)
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puerile(foolish, unwise)
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quixotic(foolish, unwise)
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round the bend(expression, idiom, foolish, unwise)
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schizo(strange, foolish, crazy, absurd)
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screw loose(expression, foolish, unwise)
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short-sighted(foolish, unwise)
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touched(unusual, strange, foolish, unwise)
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unbalanced(unusual, strange, foolish, unwise)
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unglued(foolish, unwise)
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unhinged(unusual, strange, foolish, unwise)
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unrealistic(foolish, unwise, impractical)
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unreasonable(hard, difficult, ridiculous, absurd)
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unwise
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unzipped(foolish, unwise)
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APASmart Define. (2016). outlandish thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/outlandish/thesaurus/synonyms
ChicagoSmart Define. 2016. "outlandish thesaurus" https://smartdefine.org/outlandish/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, outlandish thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/outlandish/thesaurus/synonyms>.
MLASmart Define. "outlandish thesaurus" 30 March 2016. Web. 25 September 2026. <https://smartdefine.org/outlandish/thesaurus/synonyms>