"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
"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
"with a workman's callous hands"
Source: WordNet® (An amazing lexical database of English)
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