"unfriend"

Like many language people, feel squicky about Facebook-minted words. But "unfriend," I found out today while poking around the Oxford English Dictionary, is quite an old word after all. And it seems to have meant mostly the same thing!

"I hope, Sir, that we are not mutually Unfriended by this Difference which hath happened betwixt us."

- Thomas Fuller, The Appeal of Injured Innocence, 1659