| hazardous(adjective, harmful, dangerous, injurious, detrimental) | |
| high(adjective, bad, rank, foul, disagreeable) | |
| ignoble(evil, shameful, depraved) | |
| inauspicious | |
| iniquitous(evil, shameful, distressing, harmful, depraved) | |
| insalutary(adjective, offensive, foul, disgusting, harmful) | |
| malevolent(adjective, mean, bad, wrong, evil) | |
| mawkish(revolting, overpowering, cloying) | |
| mean(adjective, evil, nasty, harsh, base) | |
| menacing(adjective, dangerous, injurious, damaging, destructive) | |
| miasmal | |
| miasmatic | |
| mildewy(adjective, rotten, stinking, smelly, putrid) | |
| narcotic | |
| nidorous | |
| olid | |
| ominous(cruel, unkind, upsetting) | |
| ornery(adjective, mean, nasty, hateful, unkind) | |
| pathological(adjective, unhealthy) | |
| perilous(adjective, harmful, dangerous, injurious, detrimental) |
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| APA | Smart Define. (2015). noxious thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/noxious/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "noxious thesaurus" https://smartdefine.org/noxious/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, noxious thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/noxious/thesaurus/synonyms>. |
| MLA | Smart Define. "noxious thesaurus" 17 July 2015. Web. 21 September 2026. <https://smartdefine.org/noxious/thesaurus/synonyms> |