Usually, the word ‘unfriend’ is associated with the world of social networking. This word, which is thought to be trendy or be in circulation since new media technologies have boomed, actually bears its origin in ancient literature.
The word ‘unfriend’ as a noun dates from around 1275, meaning ‘one who is not a friend.’ It is found in Layamon’s medieval epic poem ‘Brut’.
Meanwhile, ‘unfriend’ as a verb is attested from 1659 in a work by a T. Fuller: “I Hope, Sir, that we are not mutually un-friended by this difference which hath happened betwixt us”. When used this way, it means that someone has lost their friend.