In a way that puts other people first. If you act unselfishly, you think about what other people need or want before you think about yourself, and you are willing to give up something you wanted. It is an adverb, so it goes with a verb — you give unselfishly, you share unselfishly, you play unselfishly. It is a warm, approving word: when someone says you behaved unselfishly, they are praising you. You hear it a lot about parents, nurses, volunteers, and about team sports — in basketball, 'he plays unselfishly' means he passes the ball instead of shooting every time, and that is a real compliment. One thing worth noticing: it is not quite the same as 'kindly' or 'generously'. Generously is about how much you give; unselfishly is about the fact that you had your own wish and you set it aside. So there is a small cost hiding inside the word. It is a little formal — in everyday talk people more often say 'she never thinks of herself' or 'he always puts the kids first' — but everyone understands it, and it is very common in writing, school reports, and speeches.

無私地、不自私地；毫不自私地為他人著想