unkindness

The next thing I notice in the school history of this boy is the unkindness which he showed his school-fellows.

But as it is—I must speak plainly—what you propose is degrading to you, and an insult to me, and a rank unkindness to your father.

Nevertheless it is impossible to hide this unkindness from the eys of them that are in the Family.

Why, what is thy kindness but the very extremity of unkindness?

She was determined that she would not let Muriel's unkindness distress her any more.