8
malodorous(adjective, bad, offensive, rank, foul)
8
pestiferous(adjective, bad, evil, harmful, injurious)
8
prejudicial(adjective, cruel, unkind, distressing, upsetting)
8
stinking(adjective, bad, evil, offensive, base)
8
unhealthful(adjective, offensive, foul, disgusting, injurious)
7
beastly(adjective, mean, nasty, awful, dirty)
7
disagreeable
7
dreadful(adjective, awful, dirty, gloom, badly)
7
frightful(adjective, awful, dirty, gloom, badly)
7
spoiled(adjective, dirty, corrupt, rotten, injurious)
6
adverse(adjective, awful, dirty, gloom, badly)
6
appalling(adjective, evil, shameful, depraved, endured)
6
corrupt(adjective, bad, evil, base, foul)
6
disadvantageous(adjective, cruel, unkind, contrary, distressing)
6
gross(adjective, mean, bad, nasty, offensive)
6
horrid(adjective, bad, evil, offensive, base)
6
nocuous(adjective, cruel, unkind, distressing, upsetting)
6
septic(adjective, unhealthy, insalubrity)
6
suicidal(adjective, violent, cruel, harmful, injurious)
6
unhygienic(adjective, dirty, unhealthy, harmful, polluted)
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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>