WordWeb Online

1. (of birds) not yet having developed feathers
   "a small unfledged sparrow on the window sill"
   - immature
    
2. (of an arrow) not equipped with feathers
   "shot an unfledged arrow"
   - fledgeless, unvaned
    
3. Young and inexperienced
   "an unfledged lawyer"
   - fledgling, callow

See also: featherless, inexperienced, inexperient [non-standard], unfeathered

Antonym: fledged