unfeathered

adjectives

having no feathers
"a featherless biped"; "the unfeathered legs of an Orpington"
featherless, unfeathered
antonym
feathered
not having feathers
"the unfeathered brood"
unfeathered
is similar to
(of birds) not yet having developed feathers
"a small unfledged sparrow on the window sill"
immature, unfledged