39
toxic(adjective, unhealthy, harmful, dangerous, injurious)
34
harmful(adjective, mean, bad, wrong, evil)
30
foul(adjective, mean, bad, wrong, evil)
29
pernicious(adjective, help, mean, bad, nasty)
25
offensive(adjective, bad, evil, nasty, base)
24
deleterious(adjective, mean, bad, wrong, evil)
24
baneful(adjective, help, bad, negative, distressing)
24
noisome(adjective, bad, evil, offensive, rank)
23
poisonous(adjective, mean, bad, nasty, offensive)
23
destructive(adjective, bad, evil, cruel, negative)
23
injurious(adjective, mean, bad, wrong, evil)
20
disgusting(adjective, bad, evil, nasty, offensive)
20
deadly(adjective, help, bad, cruel, unkind)
20
detrimental(adjective, mean, bad, wrong, evil)
19
nasty(adjective, mean, bad, evil, offensive)
19
unwholesome(adjective, offensive, unpleasant, foul, disgusting)
19
unhealthy(adjective, foul, disagreeable, unhealthy, rotten)
18
vile(adjective, mean, bad, wrong, evil)
17
repulsive(adjective, bad, evil, offensive, base)
17
sickening(adjective, bad, evil, offensive, base)
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APASmart Define. (2015). Noxious thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/noxious/thesaurus/synonyms
ChicagoSmart Define. 2015. "Noxious thesaurus" https://smartdefine.org/noxious/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, Noxious thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/noxious/thesaurus/synonyms>.
MLASmart Define. "Noxious thesaurus" 17 July 2015. Web. 20 September 2026. <https://smartdefine.org/noxious/thesaurus/synonyms>