Aristotle, Nicomachean Ethics
H. Rackham, Ed.

Such then is the middle character, whether he be called ‘tactful’ or ‘witty.’ The buffoon is one who cannot resist a joke; he will not keep his tongue off himself or anyone else, if he can raise a laugh, and will say things which a man of refinement would never say, and some of which he would not even allow to be said to him. The boor is of no use in playful conversation: he contributes nothing and takes offence at everything;