caring only about yourself rather than about other people selfish behaviour Do you think I'm being selfish by not letting her go? What a selfish thing to do! It was selfish of him to leave all the work to you. opposite unselfish, selfless See related entries: SelfishExtra examples People are basically selfish. These people are completely selfish. a pretty selfish attitude Do you think I’m being selfish by not letting her go? He did it for purely selfish reasons.