223 entries under hard topic. ×

10
inflexible(adjective, person, tough, rough)
10
senseless(adjective, bad, tough, severe)
10
severe(adjective, calm, mean, tough)
9
barbarous(adjective, mean, severe, evil)
9
stiff(adjective, set, strong, severe)
9
unmoved(adjective, calm, mean, cool)
8
firm(verb, adjective, close, set, fix)
8
obtuse(noun, adjective, indifferent, apathetic)
8
rigid(adjective, set, mean, strong)
7
coldhearted(adjective, cold, indifferent, detached)
7
impenitent(adjective, tough, harsh, cruel)
7
mean(verb, adjective, cool, tough)
7
savage(adjective, mean, rough, harsh)
7
unsusceptible(noun, adjective, indifferent, cruel)
6
adamant(adjective, person, mean, rough)
6
anesthetized(adjective, tough, severe, cruel)
6
inhumane(adjective, mean, severe, evil)
6
rough(verb, adjective, person, dull)
6
rude(adjective, dull, rough, nasty)
6
solid(adjective, set, strong, firm)
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APASmart Define. (2016). callous thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/callous/thesaurus/synonyms
ChicagoSmart Define. 2016. "callous thesaurus" https://smartdefine.org/callous/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, callous thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/callous/thesaurus/synonyms>.
MLASmart Define. "callous thesaurus" 24 March 2016. Web. 25 September 2026. <https://smartdefine.org/callous/thesaurus/synonyms>