5
bloody(adjective, hard, tough, harsh, cruel)
5
bowelless
5
cold(adjective, mean, harsh, cruel, vicious)
5
cold-hearted(adjective, negative, malevolence)
5
insensitive(adjective, hard, tough, harsh, cruel)
5
mean(adjective, severe, harsh, cruel, vicious)
5
severe(adjective, mean, harsh, cruel, vicious)
4
demoniac(adjective, pitiless)
4
obdurate(adjective, mean, hard, tough, harsh)
4
stonyhearted(adjective, coldhearted)
4
unsympathizing(adjective, mean, unkind, coldhearted)
3
bestial(adjective, severe, harsh, cruel)
3
coldhearted(adjective, severe, harsh, cruel)
3
incompatible(adjective, coldhearted)
3
stony(adjective, mean, harsh, cruel, vicious)
3
stony-hearted(adjective, malevolence)
3
tough(adjective, hard, harsh, cruel, grim)
3
unapologetic
3
uncaring(adjective, mean, severe, harsh, cruel)
3
uncongenial(adjective, coldhearted)
10 years ago|6.5k views|share |citing 
APASmart Define. (2016). unmerciful thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/unmerciful/thesaurus/synonyms
ChicagoSmart Define. 2016. "unmerciful thesaurus" https://smartdefine.org/unmerciful/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, unmerciful thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/unmerciful/thesaurus/synonyms>.
MLASmart Define. "unmerciful thesaurus" 31 March 2016. Web. 25 September 2026. <https://smartdefine.org/unmerciful/thesaurus/synonyms>