15
unhealthy(adjective, offensive, dirty, foul, disgusting)
14
noxious(adjective, offensive, foul, disgusting, sick)
13
unsanitary(adjective, dirty, foul, unhealthy, unclean)
13
unwholesome(adjective, offensive, foul, disgusting, unhealthy)
11
insalubrious(adjective, offensive, foul, disgusting, harmful)
9
harmful(adjective, offensive, foul, disgusting, injurious)
9
insanitary(adjective, foul, unclean, harmful, polluted)
8
dangerous(adjective, offensive, foul, disgusting, harmful)
7
toxic(adjective, offensive, foul, unhealthy, harmful)
6
detrimental(adjective, offensive, foul, unhealthy, harmful)
6
injurious(adjective, offensive, foul, disgusting, harmful)
6
noisome(adjective, bad, offensive, foul, disgusting)
6
septic
6
unhygienic(adjective, dirty, foul, unhealthy, unclean)
5
foul(offensive, dirty, disgusting, unhealthy, unclean)
5
ill(adjective, sick)
5
poisonous(adjective, offensive, foul, disgusting, unhealthy)
5
sickly(adjective, offensive, foul, disgusting, harmful)
4
contaminated(adjective, dirty, foul, unhealthy, unclean)
4
diseased
11 years ago|9.1k views|share |citing 
APASmart Define. (2015). unhealthful thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/unhealthful/thesaurus/synonyms
ChicagoSmart Define. 2015. "unhealthful thesaurus" https://smartdefine.org/unhealthful/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, unhealthful thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/unhealthful/thesaurus/synonyms>.
MLASmart Define. "unhealthful thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/unhealthful/thesaurus/synonyms>