What is youthfully? How to use in English

The word "youthfully" has its roots in Old English. The word "youth" comes from the Old English word "geþoht," meaning "young," and the suffix "-fully" comes from the Old English word "ful" meaning "fully" or "in a manner." Together, "youthfully" originally meant "in a manner characteristic of youth" or "in a youthful manner." Over time, the meaning of "youthfully" evolved to also include connotations of energy, vitality, and enthusiasm. Today, the adjective is often used to describe behavior or actions that are characteristic of a young person, such as being full of energy and vitality, or being carefree and spontaneous. In modern English, "youthfully" is often used to describe qualities like a sense of adventure, a willingness to take risks, and a lack of inhibitions - all of which are often associated with youth.