Meanings of complete unselfishness in English

Her complete unselfishness always made him feel specially chivalrous towards her.

The unique quality in him, which distinguished him from any other man she had ever known, was his complete unselfishness.

Confidence, generosity, and complete unselfishness on both sides are needed to make the life of a married pair serene and happy.

I don't know why I suddenly became so free with my place, but there was something about her that demanded complete unselfishness.

Yet, what a prig he seemed to be at first, with his eternal gentle melancholy, his irreproachable courtesy, unvarying kindness and complete unselfishness.