Synonyms of 'callousness'
heartlessness, insensitivity, hardness
I find your statement breathtaking in its callousness and cynicism.
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Her hardness is balanced by a goofy humor.
If you accuse someone of indifference to something, you mean that they have a complete lack of interest in it.
his callous indifference to the plight of his son
Thesaurus for callousness from the Collins English Thesaurus