11
pestilential(adjective, help, bad, evil, foul)
11
putrid(adjective, rank, foul, disgusting, disagreeable)
11
rancid(adjective, awful, rank, dirty, foul)
11
terrible(adjective, dangerous, endured)
10
insalubrious(adjective, offensive, unpleasant, foul, disgusting)
10
pestilent(adjective, help, unhealthy, dangerous, injurious)
10
horrible(adjective, evil, nasty, offensive, unpleasant)
10
mischievous(adjective, mean, bad, nasty, offensive)
10
rank(adjective, corrupt, foul, disgusting, disagreeable)
10
venomous(adjective, mean, bad, evil, nasty)
9
awful(adjective, mean, bad, nasty, offensive)
9
corrupting(adjective, immoral, distressing, harmful, injurious)
9
fatal(adjective, bad, evil, harmful, dangerous)
9
malign(adjective, mean, bad, evil, nasty)
9
nauseous
9
objectionable(adjective, bad, offensive, unpleasant, foul)
9
ruinous(adjective, mean, bad, wrong, evil)
9
vicious(adjective, mean, bad, evil, nasty)
8
abhorrent(adjective, endured)
8
distasteful(adjective, offensive, unpleasant, horrible, obnoxious)
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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>