juvenile

Universal Words adjective, noun adjective 1 [onlybeforenoun] (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 SYNCHILDISH: juvenile behaviour * Don't be so juvenile! noun (formal or law) a young person who is not yet an adult: Most of the suspects were juveniles under the age of 17.