| inauspicious | |
| infective | |
| insalubrious(adjective, harmful, unwholesome, poisonous, toxic) | |
| intense(adjective, strong, severe, violent, terrible) | |
| invidious | |
| menacing(adjective, strong, severe, intense, violent) | |
| mephitical(adjective, help, poisonous) | |
| miasmic | |
| mordacious | |
| narcotic(adjective, insalubrity) | |
| ornery(adjective, mean, nasty, informal, violent) | |
| perfidious(adjective, malevolent) | |
| profane | |
| roughshod | |
| septic(adjective, insalubrity) | |
| short(adjective, discourtesy) | |
| sinister(adjective, malevolent) | |
| stern(violent, brutal, ferocious) | |
| terrible(adjective, strong, severe, intense, violent) | |
| threatening(adjective, strong, severe, intense, violent) |
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| APA | Smart Define. (2015). venomous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/venomous/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "venomous thesaurus" https://smartdefine.org/venomous/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, venomous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/venomous/thesaurus/synonyms>. |
| MLA | Smart Define. "venomous thesaurus" 11 September 2015. Web. 25 September 2026. <https://smartdefine.org/venomous/thesaurus/synonyms> |