3
hard(adjective, tough, harsh, cruel, grim)
3
inhumane(adjective, hard, tough, harsh, violent)
3
killer
3
nasty(adjective, bad, offensive, violent, wild)
3
rigorous(adjective, hard, tough, harsh, cruel)
3
rough(adjective, bad, nasty, offensive, violent)
3
virulent(injurious, damaging, deadly, destructive, fatal)
2
brute
2
cold-blooded
2
criminal(adjective, difficult)
2
deathly
2
devilish
2
diabolical
2
ferine(adjective, harsh, violent, cruel, vicious)
2
grave(aper, demoniac, pernicious, annihilative, ill-starred)
2
harmful(adjective, bad, offensive, violent, foul)
2
infernal(adjective, harsh, violent, cruel, vicious)
2
internecine(injurious, damaging, destructive, fatal, poisonous)
2
intolerable
2
malign(adjective, strong, severe, nasty, intense)
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APASmart Define. (2015). murderous thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/murderous/thesaurus/synonyms
ChicagoSmart Define. 2015. "murderous thesaurus" https://smartdefine.org/murderous/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, murderous thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/murderous/thesaurus/synonyms>.
MLASmart Define. "murderous thesaurus" 17 July 2015. Web. 23 September 2026. <https://smartdefine.org/murderous/thesaurus/synonyms>