juvenile

adjective
1
relating to young people who are not yet adults
نوجوان, کم‌سال
2
relating to young birds and animals
کم سن و سال
the prey of juvenile owls
3
silly and more typical of a child than an adult
کودکانه, بچگانه
juvenile behaviour
Don't be so juvenile!
synonym childish
noun
1
a young person who is not yet an adult
نوجوان, کم‌سن
2
a young bird or animal
جانور نابالغ, حیوان جوان
The juveniles have lighter-coloured feathers.