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]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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