If you practice the guitar every day, your fingertips will callous, making playing less painful.

His callous response to her grief surprised everyone.

The old gardener had a thick callous on his palm from years of digging.

After years of gardening by hand, her fingertips were calloused but her roses bloomed like never before.

Her callousness toward the homeless shelter volunteers shocked everyone at the meeting.

He callously dismissed her concerns during the meeting, focusing only on the numbers.

The boardroom was full of callouses who dismissed the workers' concerns.

Her constant exposure to suffering was callousing her empathy, leaving her distant from friends.

The CEO's callousnesses in laying off employees without warning were widely condemned.