a.

1. 可怕的
   I heard a fearful explosion.

   我聽到一聲可怕的爆炸。

2. 害怕的；擔心的[F][（+of）][+（that）]
   They were fearful that the river would flood.

   他們擔心河水泛濫。

   We were fearful of losing our way in the forest.

   我們擔心在森林裡迷路。

   He was fearful of her anger.

   他怕她生氣。

3. 【口】非常的；嚴重的
   What a fearful mess!

   簡直一團糟！

adj.

1. showing or causing fear.
2. informal very great.