ju·ve·nile
Pronunciation: 'joo-ve-nil
Function: adjective
Date: 15th century
1 : Not fully grown or developed; young. especially : one below the legally established age (as of 18) of adulthood
2 : Of, relating to, characteristic of, intended for, or appropriate for children or young people:
3 : Marked by immaturity; childish: juvenile behavior. See Synonyms at young.