not fledged; without sufficient feathers for flight, as a young bird.
immature; callow.

1595–1605; un-1 + fledged

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World English Dictionary
unfledged (ʌnˈflɛdʒd)
1.  (of a young bird) not having developed adult feathers
2.  immature and undeveloped

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1600, of persons, "immature, not experienced," from un- (1) "not" + pp. of fledge. Literal sense of "not yet covered in feathers" is recorded from 1610s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Unleashed dogs present a constant threat to plovers, causing nest abandonment or loss of unfledged chicks.
These closures occur while unfledged nestlings are present.
The vehicle closures are temporary and will last as long as there are unfledged plover chicks in the area.
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