73 entries under brutal topic. ×

9
fiendish(adjective, nasty, cruel, vicious, wicked)
8
cold(adjective, mean, hard, tough, severe)
8
stony-hearted(adjective, cold, cruel, unfeeling, unsympathetic)
7
malicious(adjective, mean, evil, nasty, harsh)
7
mortal(adjective, mean, harsh, cruel, determined)
6
bestial(adjective, severe, evil, nasty, harsh)
6
feral(adjective, mean, harsh, violent, cruel)
5
adamant(adjective, person, mean, hard, rough)
5
fell(adjective, harsh, violent, cruel, vicious)
4
malign(adjective, cruel, vicious, cold-blooded)
4
unappeasable(adjective, mean, harsh, cruel, determined)
4
unmoved(adjective, cold, cruel, unfeeling, unsympathetic)
3
sadistic(adjective, mean, evil, nasty, harsh)
2
malignant(adjective, mean, cruel, vicious, hateful)
2
rancorous(adjective, mean, evil, nasty, harsh)
2
steely(adjective, cold, cruel, unfeeling, unsympathetic)
1
devilish(adjective, harsh, violent, cruel, vicious)
1
diabolical(adjective, harsh, violent, cruel, vicious)
1
dispassionate(adjective, cold, cruel, unfeeling, unsympathetic)
1
hard-nosed(adjective, hard, severe, rough, firm)
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APASmart Define. (2016). merciless thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/merciless/thesaurus/synonyms
ChicagoSmart Define. 2016. "merciless thesaurus" https://smartdefine.org/merciless/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2016, merciless thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/merciless/thesaurus/synonyms>.
MLASmart Define. "merciless thesaurus" 31 March 2016. Web. 1 October 2026. <https://smartdefine.org/merciless/thesaurus/synonyms>