Unselfish means putting other people first. An unselfish act, unselfish play, unselfish to a fault.
In team sport it is high praise and means passing when you could shoot, which is a measurable thing. Elsewhere it describes character. It is milder than selfless, which claims the person is not considered at all. Note that the un- attaches to selfish, so the word is defined by what it is not.
1adjectiveunselfishPutting other people first.
“It was very unselfish of her to give up her holiday to look after her sick mother.”
unselfish is a quality of generosity.
From un- + selfish.
Etymology from Wiktionary, CC BY-SA