用作定语
▲～+n.
The dean is always full of youthful spirit.这位训导主任总是充满朝气蓬勃的精神。
用作表语
▲S+be+～
The boy looked very youthful.这个男孩显得很年轻。

youthful, boyish, juvenile, maiden, virgin
参见juvenile条。

［反义词］   aged, old, senior