Fairly means to quite a large degree. For example, if you say that something is fairly old, you mean that it is old but not very old.

You use fairly instead of 'very' to add emphasis to an adjective or adverb without making it sound too forceful.

Fairly is used to emphasize that something happens to a very great degree or extent.

You use fairly to suggest that a statement is probably or possibly true, and therefore deserves to be accepted or considered.