Discuss callous here.
adjective
1) Literally: Having the skin or outer covering hardened; indurated.
“In progress of time, the ulcers became sinuous and callous, with induration of the glands.” - Wiseman
2) Figuratively: Unfeeling; hardened in feeling.
” . . . duped into the belief that divine grace had touched the most false and callous of human hearts.” - Macaulay
[French calleux = thick or hard-skinned; Latin callosus, from callus, callum = a hard skin; calleo = to have a hard or thick skin.]
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