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 : jolly, middling, moderately, passably, pretty, reasonably, somewhat
To a degree that exceeds the bounds or reason or moderation.
His prices are unreasonably high.Meaning : Without favoring one party, in a fair evenhanded manner.
Example :
Deal fairly with one another.
Synonyms : evenhandedly, fair
Meaning : In conformity with the rules or laws and without fraud or cheating.
Example :
They played fairly.
In an unfair manner.
They dealt with him unfairly.Fairly meaning in Bengali (Bangla).