33
harmful(adjective, bad, dangerous, injurious, diseased)
31
malicious(adjective, animal, mean, bad, evil)
25
evil(adjective, mean, bad, nasty, attitude)
23
malevolent(adjective, mean, evil, nasty, attitude)
23
venomous(adjective, mean, bad, evil, nasty)
22
deadly(adjective, help, unhealthy, dangerous, diseased)
21
poisonous(adjective, mean, bad, evil, nasty)
21
spiteful(adjective, mean, nasty, attitude, cold)
18
malign(adjective, animal, mean, nasty, attitude)
18
virulent(adjective, help, mean, bad, evil)
18
baleful(adjective, mean, bad, evil, nasty)
18
bitter(adjective, mean, nasty, unfriendly, hateful)
18
pernicious(adjective, help, mean, bad, evil)
18
vicious(adjective, mean, bad, evil, nasty)
15
hateful(adjective, animal, mean, nasty, attitude)
15
destructive(adjective, bad, harmful, dangerous, deadly)
15
nasty(adjective, mean, bad, evil, attitude)
15
wicked(adjective, mean, bad, nasty, attitude)
14
hurtful(adjective, mean, bad, nasty, negative)
14
rancorous(adjective, mean, nasty, negative, vicious)
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APASmart Define. (2016). malignant thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/malignant/thesaurus/synonyms
ChicagoSmart Define. 2016. "malignant thesaurus" https://smartdefine.org/malignant/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, malignant thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/malignant/thesaurus/synonyms>.
MLASmart Define. "malignant thesaurus" 24 March 2016. Web. 20 September 2026. <https://smartdefine.org/malignant/thesaurus/synonyms>