5
pernicious(adjective, negative, grave, harmful, threatening)
4
nasty
4
sinister(adjective, nasty, negative, harmful, threatening)
4
venomous(adjective, hateful)
4
virulent(adjective, injurious, damaging, deadly, destructive)
3
corrupt
3
depraved
3
dreadful
3
fatal(adjective, deadly, lethal)
3
fiendish
3
hateful
3
mean
3
noisome(adjective, inexpedience)
3
poisonous(adjective, threatening, injurious, damaging, deadly)
2
atrocious
2
base
2
corrupting(injurious, damaging, destructive)
2
damaging(negative, harmful, injurious, destructive, hurtful)
2
deadly
2
foul
11 years ago|4.6k views|share |citing 
APASmart Define. (2015). malefic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/malefic/thesaurus/synonyms
ChicagoSmart Define. 2015. "malefic thesaurus" https://smartdefine.org/malefic/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, malefic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/malefic/thesaurus/synonyms>.
MLASmart Define. "malefic thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/malefic/thesaurus/synonyms>