hysterical

 
Pronunciation: /hɪˈstɛrɪk(ə)l/

adjective

  • 1affected by or deriving from wildly uncontrolled emotion: Janet became hysterical and began screaming the band were mobbed by hysterical fans
  • informal extremely funny: her attempts to teach them to dance were hysterical
  • 2relating to or suffering from hysteria.

Derivatives

hysterically

adverb
[as submodifier]: isn’t it hysterically funny?