92 entries under severe topic. ×

15
stony(adjective, person, mean, hard, tough)
14
cold-blooded(adjective, person, mean, hard, tough)
13
implacable(adjective, appearance, mean, hard, tough)
13
relentless(adjective, appearance, mean, hard, tough)
11
bloodthirsty(adjective, evil, nasty, harsh)
11
insensitive(adjective, hard, tough, harsh)
11
vindictive(adjective, person, mean, hard, tough)
10
obdurate(adjective, person, mean, hard, tough)
10
tough(adjective, hard, rough, harsh)
8
cold(adjective, mean, hard, tough)
8
unsparing(adjective, mean, rough, difficult)
6
bestial(adjective, evil, nasty, harsh)
6
monstrous(adjective, evil, nasty, harsh)
6
vengeful(adjective, mean, evil, nasty)
5
cold-hearted(adjective, hard, tough, cold)
5
hard-boiled(adjective, person, hard, rough)
5
intractable(adjective, appearance, hard, rough)
5
uncaring(adjective, person, mean, hard, tough)
4
coldhearted(adjective, mean, hard, harsh)
3
apathetic(adjective, person, hard, tough)
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APASmart Define. (2016). merciless thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/merciless/thesaurus/synonyms
ChicagoSmart Define. 2016. "merciless thesaurus" https://smartdefine.org/merciless/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, merciless thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/merciless/thesaurus/synonyms>.
MLASmart Define. "merciless thesaurus" 31 March 2016. Web. 29 September 2026. <https://smartdefine.org/merciless/thesaurus/synonyms>