a person who is between 13 and 19 years old a magazine aimed at teenagers Wordfinderadolescent, immature, mixed up, naive, puberty, rebellious, sulky, tearaway, teenager, young See related entries: YouthExtra examples He had grown from a tall, gangly teenager to a handsome young man. He’s acting like a lovesick teenager. Residents have been disturbed by large groups of rowdy teenagers. She’s just acting like a normal teenager. a young teenager of fourteen I first got into music as a teenager. Many teenagers are embarrassed by their parents. They complained about the behaviour of local teenagers in the park. We specifically choose topics that will appeal to teenagers.