90 entries under cruel topic. ×

1
imperturbable(adjective, calm, sensible, dark, cold)
1
indurated(adjective, hard, careless, indifferent)
1
perverse(adjective, mean, hard, tough, harsh)
1
relentless(adjective, mean, strong, hard, tough)
1
remorseless(adjective, cold, brutal, unkind)
1
spiritless(adjective, hard, careless, indifferent)
1
stiff(adjective, hard, severe, rough, firm)
1
stringent(adjective, hard, tough, severe, sharp)
1
torpid(adjective, hard, careless, indifferent)
1
unaffected(adjective, hard, tough, careless, indifferent)
1
unimpressionable(adjective, hard, careless, indifferent)
1
unmoved(adjective, calm, cold, restrained)
1
unpleasant(adjective, hard, tough, severe, sharp)
1
unrelenting(adjective, mean, strong, hard, tough)
1
unsusceptible(noun, adjective, hard, careless, indifferent)
0
acrimonious(adjective, tough, harsh, grim)
0
antagonistic(adjective, tough, harsh, grim)
0
barbarous(adjective, cold, unfeeling, unsympathetic)
0
bleak(adjective, tough, severe, harsh)
0
coldblooded(hardened, heartless)
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APASmart Define. (2016). hard-boiled thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/hard-boiled/thesaurus/synonyms
ChicagoSmart Define. 2016. "hard-boiled thesaurus" https://smartdefine.org/hard-boiled/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2016, hard-boiled thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/hard-boiled/thesaurus/synonyms>.
MLASmart Define. "hard-boiled thesaurus" 23 March 2016. Web. 1 October 2026. <https://smartdefine.org/hard-boiled/thesaurus/synonyms>