Synonyms|99Antonyms|44|Broader|0Narrower|0Related|17
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ineffective(adjective, weak, insignificant)
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insignificant(adjective, weak)
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mad as a March hare(expression, idiom, calm, sound)
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mad as a hatter(expression, idiom, calm, sound)
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nutty as fruitcake(expression, idiom, calm, sound)
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of unsound mind(expression, idiom, calm, sound)
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out of all reason(expression, idiom, reasonable, sensible)
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poor(adjective, bad)
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potty
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round the bend(expression, idiom, calm, sound)
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schizo(calm, sound)
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screw loose(expression, calm, sound)
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unbelievable(adjective, weak, insignificant)
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unconvincing(adjective, weak, insignificant)
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undependable(adjective, weak, insignificant)
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unforeseeable(adjective, inapt)
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unimportant(adjective, weak, insignificant)
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unlikely(adjective, weak, insignificant)
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unpersuasive(adjective, weak, insignificant)
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unreasonable(adjective, weak, insignificant)
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APASmart Define. (2011). believeable thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/believeable/thesaurus/antonyms
ChicagoSmart Define. 2011. "believeable thesaurus" https://smartdefine.org/believeable/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2011, believeable thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/believeable/thesaurus/antonyms>.
MLASmart Define. "believeable thesaurus" 23 May 2011. Web. 24 September 2026. <https://smartdefine.org/believeable/thesaurus/antonyms>