adolescent
/ˌædəˈlɛsənt/noun
A young person who has passed puberty but has not yet become an adult.
Example sentences
- “As an adolescent, he spent most weekends playing football.”
- “Most adolescents need more sleep than they actually get on school nights.”
Clinical in register; "teenager" is the everyday word. As an adjective it can be an insult: "adolescent humor" means immature.