What does "un" mean?

What does it mean to be born?

What the meaning of these words:

• un-finished
• un-known
• un-cut
• un-developed
• un-likely

For starters, "un" is "prefix of reversal, deprivation, or removal (as in unhand, undo, unbutton), Old English on-, un-, from Proto-Germanic *andi- (source also of Old Saxon ant-, Old Norse and-, Dutch ont-, Old High German ant-, German ent-, Gothic and- "against"), from PIE *anti "facing opposite, near, in front of, before, against" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before")". 

"More or less confused with un- (1) through similarity in the notions of "negation" and "reversal;" an adjective such as unlocked might represent "not locked" (un- (1)) or the past tense of unlock(un- (2))".

In short,

1. Can something that is NOT, be?
2. Can one murder something that is NOT?

For the serious poster, let me hear from you. CM