a young person who is not yet adult
an actor or actress who plays such a part
a young animal that has not reached sexual maturity.
for young people, no longer babies but not yet fully grown
childish and foolish
"jejune responses to our problems"
"their behavior was juvenile"
The order was..carried to Aunt Chloe by..half a dozen juvenile messengers.
出自： H. B. Stowe
She seemed to have grown less juvenile, more of a woman overnight.
出自： V. Nabokov