a.

1. 歇斯底里的
   They became hysterical after the accident.

   事故发生后他们变得歇斯底里。

2. 情绪异常激动的
   a hysterical statement

   情绪激动的声明

3. 【口】极可笑的
   The movie was hysterical. I couldn't stop laughing.

   那电影太滑稽了。我忍不住大笑。

adj.

1. wildly uncontrolled:
   the band were mobbed by hysterical fans.
   ▸informal extremely funny.
2. Psychiatry  associated with or suffering from hysteria.