- 1in a state of extreme excitement, and crying, laughing, etc. in an uncontrolled way hysterical screams a hysterical giggle He became almost hysterical when I told him. Let's not get hysterical. (disapproving) He thought I was being a hysterical female.
- 2 (informal) extremely funny synonym hilarious She seemed to find my situation absolutely hysterical. This book is hysterical.
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NAmE//hɪˈstɛrɪkli//adverb to laugh/cry/scream/sob hysterically hysterically funny