Etymology
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unselfish (adj.)

1690s, from un- (1) "not" + selfish (adj.). Similar formation in Danish uselvisk, Swedish osjälfvisk. Related: Unselfishly; unselfishness.

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Definitions of unselfish

unselfish (adj.)
disregarding your own advantages and welfare over those of others;
unselfish (adj.)
not greedy;
From wordnet.princeton.edu