1in a sensible way:he began to talk calmly and reasonably about his future
by sensible standards of judgement; justifiably:a constable who reasonably believes a breach of the peace is about to take place [sentence adverb]:it was assumed, reasonably enough, that the murder had taken place by the pond
2to a moderate or acceptable degree; fairly: [as submodifier]:she played the piano reasonably well
inexpensively:ski wear which looks good and is reasonably priced