104 entries under silly topic. ×

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half-baked(foolish, unwise)
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harebrained(foolish, unwise)
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ill-conceived(adjective, wild, foolish, senseless)
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impracticable(foolish, unwise)
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imprudent(adjective, foolish, fantastic, unwise)
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inane(foolish, unwise)
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inappropriate(foolish, unwise)
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ludicrous(adjective, foolish, fantastic, unwise)
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nonsensical(adjective, foolish, fantastic, unwise)
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out of all reason(expression, adjective, idiom, wild)
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outlandish(foolish, unwise)
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outrageous(foolish, unwise)
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peculiar(foolish, unwise)
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puerile(foolish, unwise)
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quixotic(foolish, unwise)
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ridiculous(foolish, stupid, unwise)
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short-sighted(foolish, unwise)
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stupid(foolish, unwise)
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unrealistic(foolish, unwise)
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unreasonable(adjective, foolish, stupid, fantastic)
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APASmart Define. (2015). of unsound mind thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/of_unsound_mind/thesaurus/synonyms
ChicagoSmart Define. 2015. "of unsound mind thesaurus" https://smartdefine.org/of_unsound_mind/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, of unsound mind thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/of_unsound_mind/thesaurus/synonyms>.
MLASmart Define. "of unsound mind thesaurus" 10 April 2015. Web. 29 September 2026. <https://smartdefine.org/of_unsound_mind/thesaurus/synonyms>