> un-, prefix1, expressing negation, representing OE. un-, = OFris. un-, on-, oen- (WFris. ûn-, on-, EFris. ûn-, NFris. ün-), MDu. (and Du.) on-, OS. (MLG., LG.), OHG. (MLG., G.), and Goth. un-, ON. ú-, ó- (Icel. ó-, Sw. o-, Norw. and Da. u-), corresponding to OIr. in-, an-, L. in- (im-, il-, ir-, i-), Gr. ἁν-, ἁ-, Arm. an-, Skr. an-, a-, Indo-Eur. *ṋ, an ablaut-variant of ne not: see ne adv. The prefix has been very extensively employed in English, as in the other Germanic languages, and is now the one which can be used with the greatest freedom in new formations.