6
unsanitary(adjective, dirty, unhealthy, harmful, polluted)
6
wicked(adjective, mean, bad, wrong, evil)
6
yucky(adjective, bad, offensive, awful, dirty)
5
acute(adjective, dangerous, endured)
5
base(adjective, evil, shameful, depraved)
5
gruesome(adjective, endured)
5
heinous(adjective, endured)
5
hideous(adjective, endured)
5
horrendous(adjective, endured)
5
icky(adjective, bad, offensive, awful, dirty)
5
insanitary(adjective, harmful, injurious, detrimental)
5
malefic(adjective, negative, harmful, injurious, damaging)
5
obscene(adjective, bad, offensive, foul, revolting)
5
strong(adjective, rank, corrupt, foul, disgusting)
4
contaminated(adjective, dirty, disagreeable, unhealthy, sour)
4
cruel(adjective, mean, nasty, harsh, violent)
4
despicable(adjective, evil, shameful, depraved)
4
dire(adjective, harmful, injurious, damaging, deadly)
4
foetid
4
funky(adjective, bad, foul, musty, pungent)
11 years ago|22k views|share |citing 
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>