Synonyms|109Antonyms|0|Broader|0Narrower|0Related|32
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parlous(adjective, dangerous)
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pharisaical
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sinister
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subtleties
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toxicant(adjective, poisonous)
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toxics
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unfavorable(mean, nasty, unfriendly, angry, antagonistic)
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unreceptive(unfriendly, antagonistic, aggressive)
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venomousness
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APASmart Define. (2015). viperous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/viperous/thesaurus/synonyms
ChicagoSmart Define. 2015. "viperous thesaurus" https://smartdefine.org/viperous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, viperous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/viperous/thesaurus/synonyms>.
MLASmart Define. "viperous thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/viperous/thesaurus/synonyms>