9
merciless(adjective, mean, hard, kind, gentle)
8
cruel(adjective, good, mean, hard, kind)
8
atrocious
6
unmerciful(adjective, mean, hard, cruel)
6
not good
5
harsh(adjective, good, mean, hard, agreeable)
5
heartless(adjective, gentle, friendly)
5
inhuman(adjective, good, kind)
5
inhumane(adjective, mean, hard, gentle, refined)
4
pitiless(adjective, care, mercy)
4
hardhearted
4
ruthless(adjective, calm, gentle)
4
unforgiving(adjective, mean, hard, kind, gentle)
3
barbarous(adjective, gentle, refined)
3
brutal
3
callous(kind, sympathetic)
3
cold-blooded(adjective, kind, gentle, cruel, heartless)
3
fierce
3
hard(adjective, mean, kind, gentle, bright)
3
racist
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APASmart Define. (2016). merciful thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/merciful/thesaurus/antonyms
ChicagoSmart Define. 2016. "merciful thesaurus" https://smartdefine.org/merciful/thesaurus/antonyms (accessed September 21, 2026).
HarvardSmart Define 2016, merciful thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/merciful/thesaurus/antonyms>.
MLASmart Define. "merciful thesaurus" 24 March 2016. Web. 21 September 2026. <https://smartdefine.org/merciful/thesaurus/antonyms>