104 entries under foul topic. ×

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unholy(adjective, bad, offensive, revolting)
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unsound(offensive, unhealthy, harmful, injurious)
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vulgar(adjective, bad, offensive, revolting)
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whiffy(adjective, stinking, smelly, foul-smelling)
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APASmart Define. (2015). poisonous thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/poisonous/thesaurus/synonyms
ChicagoSmart Define. 2015. "poisonous thesaurus" https://smartdefine.org/poisonous/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2015, poisonous thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/poisonous/thesaurus/synonyms>.
MLASmart Define. "poisonous thesaurus" 19 August 2015. Web. 30 September 2026. <https://smartdefine.org/poisonous/thesaurus/synonyms>