callousness

From callous + -ness.

callousness (usually uncountable, plural callousnesses)

1. The quality of being callous; emotional hardheartedness or indifference.

   Synonyms: callosity, hardheartedness, insensitivity

   Fred was known for his callousness; local panhandlers had long since learned not to try their sob stories on him.

   • 1910, Saki [pseudonym; Hector Hugh Munro], “The Soul of Laploshka”, in Reginald in Russia and Other Sketches, London: Methuen & Co. […], →OCLC, page 69:

     To have killed Laploshka was one thing; to have kept his beloved money would have argued a callousness of feeling of which I was not capable.

   • 2025 November 13, Kamala Thiagarajan, “If you're going to be kind to another human, today is the day to do it!”, in NPR‎^[1]:

     "The image of workers who had embraced each other as concrete crushed them — that final act of human kindness in the face of death — shattered my callousness completely."

2. The quality of having calluses.