51 entries under severe topic. ×

8
dog-eat-dog(adjective, mean, harsh, cruel)
8
unrelenting(adjective, mean, hard, tough)
7
bloodthirsty(adjective, harsh, violent, cruel)
7
inexorable(adjective, mean, hard, tough)
7
unyielding(adjective, mean, hard, tough)
6
barbarous(adjective, mean, hard, tough)
6
fierce(adjective, mean, hard, tough)
6
implacable(adjective, mean, hard, tough)
5
mean(adjective, harsh, cruel, vicious)
3
bestial(adjective, harsh, cruel)
3
coldhearted(adjective, harsh, cruel)
3
uncaring(adjective, mean, harsh, cruel)
2
compassionless(adjective, mean, hard, harsh)
2
hurtful(adjective, mean, harsh, cruel)
2
monstrous(adjective, harsh, cruel)
2
mortal(adjective, mean, harsh, cruel)
2
vengeful(adjective, harsh, cruel)
2
vindictive(adjective, mean, hard, tough)
1
gratuitous(adjective, mean, harsh, cruel)
1
grim(adjective, mean, hard, tough)
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APASmart Define. (2016). unmerciful thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unmerciful/thesaurus/synonyms
ChicagoSmart Define. 2016. "unmerciful thesaurus" https://smartdefine.org/unmerciful/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, unmerciful thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unmerciful/thesaurus/synonyms>.
MLASmart Define. "unmerciful thesaurus" 31 March 2016. Web. 27 September 2026. <https://smartdefine.org/unmerciful/thesaurus/synonyms>