a.

1. 精力充沛的；壯健的
   The nest held three vigorous young birds.

   這窩裡有三隻活潑的小鳥。

2. 強有力的
   make a vigorous speech

   發表強有力的演說

adj.

1. strong, healthy, and full of energy.
   ▸characterized by or involving physical strength, effort, or energy.
2. (of language) forceful.