unfriend

noun

1. One who is not a friend; an enemy.

   “It is even as I suspected, my lord, […] Ye have back-friends, my lord, that is, unfriends—or, to be plain, enemies—about the person of the Prince.”

   “I wonder often it has not drawn her out of the grave to come and stand before me, and hear me tell her how I loved her. For, sir, we parted unfriends.”

   “Thus many unfriends and some friends of the Capital agree upon the same policy with diverse and contradictory motives[…]”

   “For we desire no strangers in these lands to break the peace in which we live, and these folk are hewers of trees and hunters of beasts; therefore we are their unfriends, and if they will not depart we shall afflict them in all ways that we can.”

   “The unfriend betrays me, ignores me, denies me, breaks me down; the unfriend is against and tries to devour my personhood.”

verb

1. (rare)To sever as friends.

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

2. To defriend; to remove from one's friends list (e.g. on a social networking website).

   “"I asked her why, she said it was because I didn't comment, and I shrugged and said whatever. I didn't unfriend her."”

   “Without unfriending someone, you can now choose to limit or block (unsubscribe) someone from your newsfeed or choose to see only what Facebook deems as very important.”