His muscles became hard as iron, and he grew callous to all ordinary pain. (not reviewed by editor)
In the excess of their own misery they were callous to the suffering of their animals. (not reviewed by editor)
Samples from Other Sources
She displays a callous indifference to others` suffering.
Callous as they were to my suffering, they were equally callous to their own when anything befell them.
Jack London -- The Sea Wolf
...in a tone of the deepest reproach, as if he were the most callous of nephews...
Charles Dickens -- Great Expectations
...what he was about to say was just an aftereffect of someone else`s actions—someone else`s callousness.
Jay Asher -- Thirteen Reasons Why
"You have to understand; we`re trained to see things as logically as possible," says Cara. "So don`t think that I`m callous. But..."
Veronica Roth -- Insurgent
Dennis saw the callous way my aunt treated me, and he saw her love trysts with Mr. Stein, and he never said anything about how she acted with Mr. Stein, but he`d always offer a kind word to me, or just make a joke.