pinfeathered

from The Century Dictionary.

• Covered with pin-feathers; not fully fledged: said of young birds acquiring their first plumage after the downy state, and of old birds renewing their plumage during the molt: sometimes used figuratively.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Having part, or all, of the feathers imperfectly developed.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Having some or all of the feathers imperfectly developed.