7
unwholesome(adjective, offensive, foul, unhealthy, harmful)
7
hurtful(adjective, bad, evil, harmful, injurious)
7
infectious(adjective, unclean, catching, spreading)
7
insalubrious(adjective, unhealthy, unclean, harmful, unwholesome)
7
pestilential(adjective, bad, evil, harmful, injurious)
7
unhealthy(adjective, offensive, heavy, foul, rich)
6
poison(adjective, help, poisonous)
6
damaging(adjective, bad, harmful, dangerous, injurious)
6
mortal(adjective, bad, evil, harmful, dangerous)
6
pestiferous(adjective, bad, evil, harmful, injurious)
6
unhealthful(adjective, offensive, foul, unhealthy, harmful)
5
evil(adjective, bad, nasty, offensive, foul)
5
foul(adjective, offensive, unhealthy, unclean, harmful)
5
noisome(adjective, bad, evil, harmful, injurious)
5
pestilent(adjective, unhealthy, harmful, fatal, unwholesome)
4
contagious(adjective, unhealthy)
4
disadvantageous(adjective, injurious, damaging, destructive)
4
envenomed(adjective, insalubrity)
4
ruinous(adjective, bad, evil, harmful, injurious)
3
bad(adjective, injurious, damaging, destructive, noxious)
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APASmart Define. (2015). toxic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/toxic/thesaurus/synonyms
ChicagoSmart Define. 2015. "toxic thesaurus" https://smartdefine.org/toxic/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, toxic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/toxic/thesaurus/synonyms>.
MLASmart Define. "toxic thesaurus" 17 July 2015. Web. 22 September 2026. <https://smartdefine.org/toxic/thesaurus/synonyms>