callow

Short definition from Wiktionary

Adjective

1. 1
   Of a person: having no hair; bald, bare, hairless.
2. 2
   Of a brick: unburnt.
3. 3
   Of a young bird, or (part of) its body: having not developed feathers yet; featherless, unfledged; hence, of other animals or their bodies: having no fur or hair; furless, hairless, unfurred.
4. 4
   Of a young bird, or (part of) its body: having not developed feathers yet; featherless, unfledged; hence, of other animals or their bodies: having no fur or hair; furless, hairless, unfurred: Lacking life experience; immature, inexperienced, naive; also, of or relating to something immature or inexperienced.
5. 5
   In the life cycle of an animal: newly born or hatched; juvenile.
6. 6
   Synonym of teneral (“of certain insects or other arthropods such as spiders: lacking colour or firmness just after ecdysis (“shedding of the exoskeleton”)”).
7. 7
   Of land: having no vegetation; bare.
8. 8
   Of land: low-lying and near a river, and thus regularly submerged.

Noun

1. 1
   Synonym of teneral (“an insect or other arthropod such as a spider which has just undergone ecdysis (“shedding of the exoskeleton”) and so lacks colour or firmness”).
2. 2
   An alluvial flat.
3. 3
   The upper layer of rubble in a quarry which has to be removed to reach the material to be mined.
4. 4
   A young bird which has not developed feathers yet; a nestling.
5. 5
   A young bird which has not developed feathers yet; a nestling: A person lacking life experience; an immature or naive person.
6. 6
   Synonym of topsoil (“upper layer of soil”).
7. 7
   A low-lying meadow near a river which is regularly submerged.

Proper noun

1. 1
   A surname.