From WordNet (r) 2.0 (August 2003) [wn]:
juvenile
adj 1: of or relating to or characteristic of or appropriate for
children or young people; "juvenile diabetes";
"juvenile fashions"
2: displaying or suggesting a lack of maturity; "adolescent
insecurity"; "jejune responses to our problems"; "their
behavior was juvenile"; "puerile jokes" [syn:
adolescent, jejune, puerile]
n : a youthful person [syn: juvenile person] [ant: adult]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Juvenile \Ju"ve*nile\ (?; 277), a. [L. juvenilis, from juvenis
young; akin to E. young: cf. F. juv['e]nile, juv['e]nil. See
Young.]
[1913 Webster]
1. Young; youthful; as, a juvenile appearance. "A juvenile
exercitation." --Glanvill.
[1913 Webster]
2. Of or pertaining to youth; as, juvenile sports.
3. Characteristic of children; immature; childish; puerile;
infantile; as, a juvenile temper tantrum.
[PJC]
Syn: Puerile; boyish; childish. See Youthful.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Juvenile \Ju"ve*nile\, n.
A young person or youth; -- used sportively or familiarly.
--C. Bront['e].
[1913 Webster]