juvenile
adjectiveUK /ˈdʒuːvənaɪl/
US /ˈdʒuːvənəl/
Young; not fully grown yet.
The zoo has a special area for juvenile animals.
OTHER MEANINGS
2. A young person below the age of adulthood.
The court handles cases involving juveniles separately.
3. Silly or immature in behavior.
His juvenile jokes annoyed the whole class.
4. A young bird or animal.
The juvenile robin had speckled brown feathers.