- characterized by youth; young.
- of, relating to, or befitting youth: youthful enthusiasm.
- having the appearance, freshness, vigor, etc., of youth: She is 60 but her optimism has kept her youthful.
- in an early period of existence; early in time.
- (of topographical features) having undergone erosion to a slight extent only.
- of, relating to, possessing, or characteristic of youth
- fresh, vigorous, or active
- in an early stage of development
- (of a river, valley, or land surface) in the early stage of the cycle of erosion, characterized by steep slopes, lack of flood plains, and V-shaped valleys
