cal ‧ lous /ˈkæləs/ BrE AmE adjective
[ Date: 1300-1400 ; Language: Old French ; Origin: calleux , from Latin callosus , from callus ; ⇨ ↑ callus ]
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]