/ ˈkæləs; NAmE / adjective
not caring about other people's feelings or suffering
SYN cruel , unfeeling :
a callous killer / attitude / act
a callous disregard for the feelings of others
► cal·lous·ly adverb
► cal·lous·ness noun [ U ]
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WORD ORIGIN
late Middle English (in the Latin sense): from Latin callosus hard-skinned.