Synonyms|239Antonyms|51|Broader|0Narrower|0Related|53
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fishy
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iffy
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impugnable
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incredulous
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indefinite
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insecure
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irresolute
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litigious
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moot
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precarious
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problematic
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problematical
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questionable
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shady
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shaky
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shifty
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skittish
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suspicious
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swerving(adjective, sure, dubious)
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tremulous
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APASmart Define. (2015). surefire thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/surefire/thesaurus/antonyms
ChicagoSmart Define. 2015. "surefire thesaurus" https://smartdefine.org/surefire/thesaurus/antonyms (accessed September 24, 2026).
HarvardSmart Define 2015, surefire thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/surefire/thesaurus/antonyms>.
MLASmart Define. "surefire thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/surefire/thesaurus/antonyms>