ûn-

1. (morpheme) Used to form nouns denoting a lack of the prefixed noun; un-
2. (morpheme) Used to form adjectives meaning the lack of the characteristic of the suffixed adjective; un-

Etymology

Inherited from Old Frisian: un-

Cognate with Saterland Frisian: uun-

Cognate with English: un-

In summary

From Old Frisian un-, from Proto-West Germanic *un-. Cognates include Saterland Frisian uun- and English un-.