n.
朝气蓬勃

Vigorous \Vig"or*ous\, a. [Cf. OF. vigoros, F. vigoureux, LL.
vigorosus.]
1. Possessing vigor; full of physical or mental strength or
active force; strong; lusty; robust; as, a vigorous youth;
a vigorous plant.

Famed for his valor, young,
At sea successful, vigorous and strong. --Waller.

2. Exhibiting strength, either of body or mind; powerful;
strong; forcible; energetic; as, vigorous exertions; a
vigorous prosecution of a war.

The beginnings of confederacies have been always
vigorous and successful. --Davenant.
※ -- {Vig"or*ous*ly}, adv. --
{Vig"or*ous*ness}, n.