Definitions from Wiktionary (callous)

▸ adjective:  (figurative) Emotionally hardened; unfeeling and indifferent to the suffering/feelings of others.
▸ adjective:  (literal) Having calluses, or relating to calluses.
▸ noun:  Alternative form of callus [A hardened area of the skin (especially on the foot or hand) caused by repeated friction, wear or use.]
▸ verb:  Alternative form of callus [(intransitive) To form such hardened tissue.]
▸ Also see callous

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