The prefix un- usually means not. For example: un happy un locked un fair The prefixes dis- and mis- usually have negative meanings. For example: dis agree dis obey mis behave ...

Take the word “unhappiness,” for example. The prefix “un” means not, while the suffix “ness” represents a state or condition.

And “unkempt” also can mean “not polished or refined; crude; rough.” Now for a cautionary note: Something that looks like a prefix may not be one.