1. (adjective) (of birds) not yet having developed feathers

• immature

2. (adjective) (of an arrow) not equipped with feathers

• fledgeless
• unvaned

3. (adjective) young and inexperienced

• callow
• fledgling

1. (adjective) (of birds) not yet having developed feathers

• unfeathered

2. (adjective) (of an arrow) not equipped with feathers

• featherless
• unfeathered

3. (adjective) young and inexperienced

• inexperienced
• inexperient

1. (adjective) young and inexperienced

• entrant
• fledgeling
• fledgling
• freshman
• neophyte
• newbie
• newcomer
• starter

1. (adjective) (of birds) not yet having developed feathers

• fledged
• mature