Meaning of “callous” in the English Dictionary

"callous" in British English

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callousadjective

uk /ˈkæl.əs/ us /ˈkæl.əs/

unkind, cruel, and without sympathy or feeling for other people:

It might sound callous, but I don't care if he's homeless. He's not living with me!
callously
adverb uk /ˈkæl.əs.li/ us /ˈkæl.əs.li/
callousness
noun [ U ] uk /ˈkæl.əs.nəs/ us /ˈkæl.əs.nəs/

(Definition of “callous” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"callous" in American English

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callousadjective

us /ˈkæl·əs/

without sympathy or feeling for other people:

As callous as it may sound, trying to help some students is a waste of time.

(Definition of “callous” from the Cambridge Academic Content Dictionary © Cambridge University Press)