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English definition of “juvenile”

juvenile

adjective     /ˈdʒuː.vən.aɪl/ US  /-nəl/
C1 formal or specialized law relating to a young person who is not yet old enough to be considered an adult : juvenile crime / offenders Describing people who are young disapproving silly and typical of a child : juvenile behaviour a juvenile sense of humour Physically and mentally mature and immature
(Definition of juvenile adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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