4
ghastly(adjective, bad, offensive, foul, deep)
4
hateful(adjective, mean, bad, wrong, evil)
4
ill(adjective, mean, bad, evil, harsh)
4
malicious(adjective, mean, bad, wrong, evil)
4
miasmic
4
musty(adjective, bad, rank, foul, disagreeable)
4
painful(adjective, bad, offensive, foul, revolting)
4
polluted(adjective, bad, offensive, rank, foul)
4
reeking(adjective, bad, offensive, rank, foul)
4
reeky
4
shocking(adjective, evil, shameful, depraved, endured)
4
sickly(adjective, offensive, foul, disgusting, harmful)
4
smelly(adjective, rank, foul, disagreeable, sour)
4
wretched(adjective, evil, shameful, depraved, endured)
3
agonizing(adjective, endured)
3
atrocious(adjective, awful, dirty, gloom, badly)
3
catastrophic(adjective, harmful, injurious, damaging, deadly)
3
contagious(adjective, unhealthy)
3
counterproductive
3
deplorable(adjective, endured)
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APASmart Define. (2015). noxious thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/noxious/thesaurus/synonyms
ChicagoSmart Define. 2015. "noxious thesaurus" https://smartdefine.org/noxious/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, noxious thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/noxious/thesaurus/synonyms>.
MLASmart Define. "noxious thesaurus" 17 July 2015. Web. 21 September 2026. <https://smartdefine.org/noxious/thesaurus/synonyms>