selfless

self|less /s'elfləs/
[ADJ]
If you say that someone is selfless, you approve of them because they care about other people more than themselves.
Perhaps the only all-enduring and selfless love was that of a mother for her child.
selflessly [ADV]
I've never known anyone who cared so selflessly about children.
selflessness [N-UNCOUNT]
I have enormous regard for his selflessness on behalf of his fellow man.