/ ˈdʒuːvənaɪl; NAmE -vənl/ adjective , noun
■ adjective
1.
[ only before noun ] ( formal or law ) connected with young people who are not yet adults :
juvenile crime / employment
juvenile offenders
2.
( disapproving ) silly and more typical of a child than an adult
SYN childish :
juvenile behaviour
Don't be so juvenile!
■ noun
( formal or law ) a young person who is not yet an adult
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WORD ORIGIN
early 17th cent.: from Latin juvenilis , from juvenis young, a young person.