ungdommelig
Ungdommelig is a Norwegian adjective meaning youthful or young-looking. It describes qualities associated with youth, such as energy, vitality, or a fashion or demeanor that recalls younger people. The term can be applied to persons, styles, or design that convey a sense of youth. In neutral to positive contexts it often signals modernity or vigor; in some cases it can imply immaturity if used critically.
Etymology and form: The word is formed from ungdom, youth, with the suffix -elig, which creates adjectives
Usage notes: In fashion and marketing, ungdommelig is common to describe bright colors, casual or contemporary
Translation: In English, the closest equivalents are youthful, youth-like, or young-looking. The term is widely understood