not sung; not uttered or rendered by singing.
not celebrated in song or verse; not praised or acclaimed: the unsung heroes of the war.

1375–1425 for def 1; 1660–70 for def 2; late Middle English; see un-1, sung

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World English Dictionary
unsung (ʌnˈsʌŋ)
1.  not acclaimed or honoured: unsung deeds
2.  not yet sung

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1422, "not uttered in a song," from un- (1) "not" + pp. of sing. Cf. Ger. ungesungen. Meaning "not celebrated" is recorded from 1667.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Yet the picture emerging of this unsung organism is increasingly sinister.
The unsung form of prejudice that is relevant today is that against
  disabilities, both hidden and tangible.
We all know editors and reviewers who are conscientious and perceptive and
  deserve considerable credit for their unsung efforts.
Here are some ideas for the unsung heroine in the corner of your kitchen.
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