The Oxford Thesaurus An A-Z Dictionary of Synonyms - juvenileadj.

1) young, youthful, under age, minor, teenage(d) , immature, adolescent, childish, infantile, babyish, puerile, unsophisticated: What could be more juvenile than painting graffiti on public buildings. --n. 2) youth, boy, girl, adolescent, minor, Law infant: The police have arrested two juveniles for attacking an old lady in her own home.