0 N-COUNT
A juvenile is a child or young person who is not yet old enough to be regarded as an adult.
The number of juveniles in the general population has fallen by a fifth in the past 10 years.
1 ADJ
Juvenile activity or behaviour involves young people who are not yet adults.
Juvenile crime is increasing at a terrifying rate.
...a scheme to lock up persistent juvenile offenders.
2 ADJ-GRADED
If you describe someone's behaviour as juvenile, you are critical of it because you think that it is silly or childish.
He's a typical male, as he gets older he becomes more juvenile.
3 N-COUNT
Young animals are sometimes referred to as juveniles .
There is relatively little information about juveniles, maybe you can watch a bilingual story to relax your mood, I wish you a happy day!