juvenility

名词 juvenility:

1. lacking and evidencing lack of experience of life
   同义词：callowness, jejuneness
2. the freshness and vitality characteristic of a young person
   同义词：youth, youthfulness

ju.ve.nil.i.ty

n.（名词）
【复数】 ju.ve.nil.i.ties
The quality or condition of being juvenile; youthfulness.
年少：年轻的特性或状态；青年特性

Foolishly juvenile behavior or character; immaturity.
幼稚：愚蠢的稚气的行为或性格；不成熟
An instance of juvenile behavior.
幼稚行为的事例