juvenile
adj.
1620s, from Latin iuvenilis "of or belonging to youth," from iuvenis "young person," originally "young" (compare French jeune; see young). Juvenile delinquency first recorded 1816; Juvenile delinquent the following year.
〔李〕[juven;-ilea.] a.青少年的，幼稚的 n.青少年 ←juven (L juvenis)=young 年青的
〔蒋〕[juven年少，-ile形容词后缀，…的] 青少年的;[转作名词] 青少年