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English definition of “hysterical”

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adjective  /hɪˈster·ɪ·kəl/ us  
unable to control your emotions or behavior because you are very frightened, excited, etc.: Calm down, you’re getting hysterical. She broke into hysterical laughter (= laughter that is uncontrollable). infml That joke was hysterical (= extremely amusing).
adverb [not gradable]  /hɪˈster·ɪk·li/ us  
Gillian was laughing/crying hysterically.
(Definition of hysterical from the Cambridge Academic Content Dictionary © Cambridge University Press)
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