Skim through the dialogue snd find a word beginning wirh un-. What do we use this prefix

Question

Skim through the dialogue snd find a word beginning wirh un-. What do we use this prefix

Answer 1

The prefix un means NOT and is widely used in adjectives (and in their derivative nouns and adverbs) to show the opposite or negative side.
For example:
able - unable 
clear - unclear
fair - unfair
grateful - ugrateful