Meaning : To certain extent or degree.
							Example : 
							Pretty big.
							Pretty bad.
							Jolly decent of him.
							The shoes are priced reasonably.
							He is fairly clever with computers.
							
Synonyms : fairly, jolly, middling, moderately, passably, pretty, somewhat
To a degree that exceeds the bounds or reason or moderation.
His prices are unreasonably high.Meaning : With good sense or in a reasonable or intelligent manner.
							Example : 
							He acted sensibly in the crisis.
							Speak more sanely about these affairs.
							Acted quite reasonably.
							
Not in a reasonable or intelligent manner.
She reacted unreasonably when she learned she had failed.