DictionaryjuvenileYoung or not fully grown
adjective / noun

juvenile

JOO-vuh-nul/ˈdʒuːvənl/

Belonging to an early stage before adulthood.

Her juvenile reaction to losing the game includes sticking out her tongue.

An adult reacts childishly to losing a board game: she sticks out her tongue and petulantly sweeps her remaining pieces off the board while her opponent watches with restrained disbelief.
Etymology

The pieces express ‘belonging to youth.’ That can neutrally describe young people or, when applied to behavior, judge it as immature rather than merely youthful.

In context

rosaryfilms9:28
offenders and their families the family and new Services Bureau came into being in 1974 specifically to meet the needs of young people who were being placed inappropriately in the juvenile justice system
Juvenile Status Offenders And Their Families / Educational Documentary Video

More examples

  • The program offers job training to juveniles.
  • This juvenile tree has not yet produced fruit.
  • The shelter houses adult cats and juveniles in separate rooms.

Forms

juvenile · juveniles

Similar words

young
More general and less formal; does not necessarily mean immature.
adolescent
Specifically describes the stage between childhood and adulthood.
immature
Emphasizes incomplete development rather than simply being young.