No cut to unkindness. [ Proverb ]

Unkindness has no remedy at law. [ Proverb ]

A small unkindness is a great offence. [ Hannah More ]

This was the most unkindest cut of all. [ William Shakespeare ]

And in their height of kindness are unkind. [ Young ]

Rich gifts wax poor when givers prove unkind. [ William Shakespeare ]

There is nothing that needs to be said in an unkind manner. [ Hosea Ballou ]

She hath tied sharp-toothed unkindness, like a vulture here. [ William Shakespeare ]

A real grief I never can find till thou provest perjured or unkind. [ Prior ]

Hard unkindness' altered eye. That mocks the tear it forced to flow. [ Gray ]

Come, we have a hot venison pasty to dinner; come, gentlemen, I hope we shall drink down all unkindness. [ William Shakespeare ]

Unkind language is sure to produce the fruits of unkindness - that is, suffering in the bosom of others. [ Benthem ]