The doctors become calloused; they are used to seeing pain and suffering.

He, like many another, had become calloused.

Nahum, however, ignored the warning, for he had by that time become calloused to strange and unpleasant things.

But we must not let ourselves become calloused by it, nor shut it away and out of our minds.

Let us hope he will pull through. For four years every professor had been pulling Peter through, and the conscience of each had become calloused.

Too well I knew I was becoming calloused to the evils around me.

After a few years' work, the skin becomes calloused and tough.