What is the meaning of Un-?

not

lack of

contrary to traditional norms; unconventional

the inverse of a specified action

deprive of, release from, free from, remove from, extract from

intensifying a verb that already suggests opposition or removal

Used for the digit one to form systematic element names of elements whose existence has been predicted, and which have not yet been given a trivial name.

Used to form large numbers as the first in the sequence.

mono-, uni-

un-

grave; bad; horrifying

romanization of 𐌿𐌽-

Rōmaji transcription of うん

prefixed form of un (“at, on”)

1. at, to, toward
2. on, up
3. used to make certain intransitive verbs transitive

   at, to, toward

   on, up

   used to make certain intransitive verbs transitive

   uni-, mono-, one

   not, un-

   negation or absence of: un-, non-

   bad

   forms verbs from verbs, with an opposite or reversive sense

   un-; prefix of negation, absence or contrariness

   Source: wiktionary.org