"juvenile" in the noun sense
1. juvenile, juvenile person
a young person, not fully developed
"juvenile" in the adjective sense
1. juvenile
of or relating to or characteristic of or appropriate for children or young people
"juvenile diabetes"
"juvenile fashions"
2. adolescent, jejune, juvenile, puerile
displaying or suggesting a lack of maturity
"adolescent insecurity"
"jejune responses to our problems"
"their behavior was juvenile"
"puerile jokes"
Source: WordNet® (An amazing lexical database of English)
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