a prefix meaning “not,” freely used as an English formative, giving negative or opposite 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).
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Origin of un-1
Definition for un- (2 of 2)
a prefix freely used in English to form verbs expressing a reversal of some action or state, or removal, deprivation, release, etc. (unbend; uncork; unfasten, etc.), or to intensify the force of a verb already having such a meaning (unloose).
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British Dictionary definitions for un- (1 of 2)
(freely used with adjectives, participles, and their derivative adverbs and nouns: less frequently used with certain other nouns) not; contrary to; opposite ofuncertain; uncomplaining; unemotionally; untidiness; unbelief; unrest; untruth
Word Origin for un-
from Old English on-, un-; related to Gothic on-, German un-, Latin in-
British Dictionary definitions for un- (2 of 2)
prefix forming verbs and verbal derivatives
denoting reversal of an action or stateuncover; untangle
denoting removal from, release, or deprivationunharness; unman; unthrone
Word Origin for un-
from Old English un-, on-; related to Gothic and-, German ent-, Latin ante
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medicine definitions for un-
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.