Longman Dictionary of Contemporary English homepage

Sense: 1
Origin: Old English
Sense: 2
Origin: Old English un-, on-, from and- 'against'

un-

 prefix
     
un-
1XX [in adjectives, adverbs, and nouns] used to show a negative, a lack, or an opposite [= not]:
unfair
unhappy
unfortunately
uncertainty
2 [in verbs] used to show an opposite of a particular action:
to undress (=to take your clothes off)
Have you unpacked yet (=taken your things out of your suitcase)?
I heard Lila unlock the front door.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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