The definition of youthful is someone who is young and vigorous, or is something that has the characteristics of someone young such as active and new.
Being in an early period of life or growth; not old
Of, relating to, or undergoing adolescence.
The definition of childish is a person or thing that is silly, immature, like a child or directed at children.
Find another word for boyish. In this page you can discover 17 synonyms, antonyms, idiomatic expressions, and related words for boyish, like: juvenile, youthful, young, girlish, boylike, adolescent, childish, schoolboyish, , childlike and roguish.