un-

un- [ʌn] prefix

[Sense: 1; Origin: Old English]

[Sense: 2; Origin: Old English un-, on-, from and- 'against']

1.) [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.