Synonyms for Fairly (same or very similar meaning)
WordNet sense 1 (in conformity with the rules or laws and without fraud or cheating):
clean, fairWordNet sense 2 (without favoring one party, in a fair evenhanded manner):
evenhandedlyWordNet sense 3 (to a moderately sufficient extent or degree):
middling, moderately, passably, reasonably, somewhat, within reasonFrom the ODE community, based on WordNetadd/edit