18
bloodlust
16
ruthlessness(noun, abuse, evil, dislike, violence)
11
cruelty
11
pitilessness(noun, cruelty, harshness, unkindness, coldness)
9
harshness(noun, dislike, disagreement, advantage, hatred)
8
brutality(noun, violence, severity, torture, cruelty)
8
inhumanity(noun, violence, severity, torture, cruelty)
7
unmercifulness(noun, pitilessness)
5
savagery(noun, violence, severity, torture, cruelty)
4
hardheartedness(noun, torture, cruelty, harshness, malice)
4
heartlessness(noun, violence, severity, torture, cruelty)
4
meanness(noun, dislike, disagreement, advantage, head)
4
severity(noun, violence, torture, cruelty, coarseness)
3
callousness(noun, violence, severity, torture, cruelty)
3
hardness
3
relentlessness(noun, ruthlessness, pitilessness)
2
animality(noun, violence, severity, torture, cruelty)
2
atrocity(noun, cruelty, coldness, viciousness, callousness)
2
barbarism(noun, violence, severity, torture, cruelty)
2
barbarity(noun, violence, severity, torture, cruelty)
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APASmart Define. (2015). mercilessness thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/mercilessness/thesaurus/synonyms
ChicagoSmart Define. 2015. "mercilessness thesaurus" https://smartdefine.org/mercilessness/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, mercilessness thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/mercilessness/thesaurus/synonyms>.
MLASmart Define. "mercilessness thesaurus" 21 December 2015. Web. 21 September 2026. <https://smartdefine.org/mercilessness/thesaurus/synonyms>