juvenile

/ˈdʒuːvənaɪl/
adjective
  1. Relating to or typical of young people; youthful.
    • The library has a special section for juvenile fiction.
    • The school offers programs for juvenile offenders to help them learn new skills.
    • His juvenile enthusiasm made the project fun for everyone.
  2. Childish or immature in behavior or attitude.
    • Her juvenile tantrum embarrassed her friends.
    • The movie's humor was too juvenile for adult audiences.
    • Stop making juvenile jokes during the serious meeting.
Antonyms
noun
  1. A young person or child, especially one below the age of legal adulthood.
    • The court handles cases involving juveniles separately from adults.
    • Many juveniles enjoy spending time outdoors with their friends.
    • The park has a playground designed for juveniles.
Antonyms
What does "juvenile" mean? | whatsthatwordmean | whatsthatwordmean