Juvenile (adjective)

1. Relating to young people or childhood.
2. Immature or childish in behavior or manner.

Origin:

From middle english iuvenil, from latin iuvenīlis, from iuvenis 'young man, youth'.

Examples:

1. The juvenile detention center was a place for young offenders to receive help and support.
2. The juvenile animals were playful and full of energy, always exploring their surroundings.
3. The juvenile behavior was a source of frustration for the adults, who wished the children would act more maturely.
4. The juvenile actors were inexperienced but full of talent and potential.
5. The juvenile book series was a hit with children and adults alike, due to its witty humor and imaginative story.