Immature, lacking in life experience.
Newly emerged or hatched, juvenile.
Lacking color or firmness (of some kinds of insects or other arthropods, such as spiders, just after ecdysis); teneral.
Shallow or weak-willed.
Unburnt.
Unfledged (of a young bird), featherless.
Of land: low-lying and liable to be submerged.
Bald, hairless, bare.
A callow young bird.
An alluvial flat.
A callow or teneral phase of an insect or other arthropod, typically shortly after ecdysis, while the skin still is hardening, the colours have not yet become stable, and as a rule, before the animal is able to move effectively.
Done with insufficient energy, enthusiasm, etc.
Insufficiently cooked, so as to be unpalatable or inedible.
Very lightly cooked.
The broccoli was nicely undercooked.