displaying or suggesting a lack of maturity; "adolescent insecurity"; "jejune responses to our problems"; "their behavior was juvenile"; "puerile jokes"
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
a person not legally of age, or who is younger than may be charged with an offence
Juvenile offenders receive special treatment and the overriding emphasis is on rehabilitation rather than punishment, with criminal proceedings being avoided wherever possible There is a juvenile court where crimes committed by children are tried
disapproval 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. = childish
The early stage in the life cycle of anadromous fish when they migrate downstream to the ocean