(~s)
1.
A ~ is a child or young person who is not yet old enough to be regarded as an adult. (FORMAL)
The number of ~s in the general population has fallen by a fifth in the past 10 years.
N-COUNT
2.
Juvenile activity or behaviour involves young people who are not yet adults.
Juvenile crime is increasing at a terrifying rate.
ADJ: ADJ n
3.
If you describe someone’s behaviour as ~, 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 ~.
= childish
ADJ disapproval