40
harmful(adjective, help, mean, bad, wrong)
39
injurious(adjective, help, mean, bad, wrong)
30
damaging(adjective, mean, bad, wrong, evil)
30
detrimental(adjective, help, mean, bad, wrong)
28
destructive(adjective, bad, harmful, injurious, damaging)
28
pernicious(adjective, mean, bad, evil, nasty)
23
hurtful(adjective, help, mean, bad, wrong)
19
bad(adjective, help, harmful, damaging, hurtful)
18
baleful(adjective, mean, evil, nasty, negative)
18
noxious(adjective, mean, bad, wrong, evil)
17
baneful(adjective, evil, offensive, negative, foul)
15
ruinous(adjective, mean, bad, wrong, evil)
14
disadvantageous(adjective, negative, harmful, inexpedience, detrimental)
14
poisonous(adjective, mean, bad, evil, nasty)
14
prejudicial(adjective, bad, harmful, damaging, hurtful)
13
adverse(adjective, distressing, unfavorable, hurtful, detrimental)
13
evil(adjective, help, mean, bad, wrong)
13
mischievous(adjective, help, mean, bad, nasty)
12
ill(adjective, help, bad, evil, unfavorable)
12
toxic(adjective, bad, evil, offensive, foul)
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APASmart Define. (2016). deleterious thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/deleterious/thesaurus/synonyms
ChicagoSmart Define. 2016. "deleterious thesaurus" https://smartdefine.org/deleterious/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, deleterious thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/deleterious/thesaurus/synonyms>.
MLASmart Define. "deleterious thesaurus" 24 March 2016. Web. 20 September 2026. <https://smartdefine.org/deleterious/thesaurus/synonyms>