a.

1. 精力充沛的；健壮的
   The nest held three vigorous young birds.

   这窝里有三只活泼的小鸟。

2. 强有力的
   make a vigorous speech

   发表强有力的演说

adj.

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