Hi Light 1993
Depends on how your using it .
Natural = normal. Example: It is only natural to be hot on a sunny day.
Unnatural = not normal Example: A dog with two tails is unnatural.
A little unnatural = not very normal. Example: It is a little unnatural to speak another language not your own, until you become fluent.
Not sure if this is what you are asking. Hope it helps.