Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: calleux, from Latin callosus, from callus; CALLUS

callous

adjective
     
cal‧lous
not caring that other people are suffering:
We were shocked at the callous disregard for human life.
a callous attitude
the callous slaughter of seals
callously adverb
callousness noun [uncountable]

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