[1505–15; un-1 + friend + -ed3]This word is first recorded in the period 1505–15. Other words that entered Englishat around the same time include: grade, producer, runaway, terrace, wagonun- is a prefix meaning “not,” freely used as an English formative, giving negative oropposite force in adjectives and their derivative adverbs and nouns (unfair; unfairly; unfairness; unfelt; unseen; unfitting; unformed; unheard-of; un-get-at-able), and less freely used in certain other nouns (unrest; unemployment); -ed is a suffix forming adjectives from nouns. Other words that use the affix -ed include: bearded, monied, tender-hearted