"callous" in the verb sense
1. callous, cauterize, cauterise
make insensitive or callous deaden feelings or morals
"callous" in the adjective sense
1. callous, indurate, pachydermatous
emotionally hardened
"a callous indifference to suffering"
"cold-blooded and indurate to public opinion"
2. calloused, callous, thickened
having calluses having skin made tough and thick through wear
"calloused skin"
"with a workman's callous hands"
Source: WordNet® (An amazing lexical database of English)
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