67 entries under toughened topic. ×

6
unresponsive(adjective, calm, person, dull, mean)
4
inflexible(adjective, person, mean, hard, careless)
3
impassive(adjective, calm, hard, careless, indifferent)
2
coldhearted(adjective, hard, cold, indifferent, detached)
2
thick-skinned(adjective, mean, hard, tough, severe)
2
unsentimental(adjective, cynical, hard-boiled, hard-bitten)
1
accustomed(adjective, hard, unfeeling, unsympathetic, hardened)
1
benumbed(adjective, hard, tough, severe, cold)
1
blind to(expression, adjective, hard, careless, indifferent)
1
careless(adjective, hard, indifferent, cruel, apathetic)
1
case-hardened(adjective, hard, careless, indifferent, cruel)
1
contemptuous(adjective, hard, unfeeling, unsympathetic, hardened)
1
deaf to(expression, adjective, hard, careless, indifferent)
1
disdainful(adjective, hard, unfeeling, unsympathetic, hardened)
1
habituated(adjective, hard, unfeeling, unsympathetic, hardened)
1
hard-as-nails(adjective, hard, unfeeling, unsympathetic, hardened)
1
hard-bitten(adjective, hard, careless, indifferent, cruel)
1
hard-nosed(adjective, mean, hard, tough, harsh)
1
impenetrable(adjective, hard, unfeeling, unsympathetic, hardened)
1
impenitent(adjective, hard, tough, careless, indifferent)
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APASmart Define. (2016). uncompassionate thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/uncompassionate/thesaurus/synonyms
ChicagoSmart Define. 2016. "uncompassionate thesaurus" https://smartdefine.org/uncompassionate/thesaurus/synonyms (accessed October 1, 2026).
HarvardSmart Define 2016, uncompassionate thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/uncompassionate/thesaurus/synonyms>.
MLASmart Define. "uncompassionate thesaurus" 31 March 2016. Web. 1 October 2026. <https://smartdefine.org/uncompassionate/thesaurus/synonyms>