immature or inexperienced

a callow youth.

(of a young bird) featherless; unfledged.

a recently hatched worker ant.

adjective

experienced , initiated , mature , sophisticated

adjective

crude , green , guileless , inexperienced , infant , jejune , jellybean , juvenile , kid , low tech , naive , not dry behind ears , puerile , raw , sophomore , tenderfoot , unbaked , unfledged , unripe , unsophisticated , untrained , untried , youngnotes:callow means lacking experience of life , immature - while shallow means lacking depth of intellect , emotion , or knowledge , bald , bare , immature , infantile , marshy , shallow , unfeathered , youthful