Wiktionary
unselfishly
adv. In an unselfish manner.
WordNet
unselfishly
adv. in an unselfish manner; "he acted unselfishly when he helped her get the promotion" [ant: egotistically]
Usage examples of "unselfishly".
As she pulled her nightgown over her head and dropped it to the floor, everything in her rebelled at leaving him to this lonely release after he’d so unselfishly seen to hers.