juvenile

adjective

• 1for or relating to young people:juvenile crime
• denoting a theatrical or film role representing a young person:the romantic juvenile lead
• relating to young birds and animals: the prey of juvenile owls juvenile mortality in whelks

• 2childish; immature:she’s bored with my juvenile conversation

noun

• a young person.
• Law a person below the age at which ordinary criminal prosecution is possible (18 in most countries): the law relating to the sentencing of juveniles
• an actor playing a juvenile role.
• a young bird or animal: the light-coloured plumage of a juvenile