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English definition of “hysterical”

hysterical

adjective uk   /hɪˈster.ɪ.kəl/ us  
C1 unable to control your feelings or behaviour because you are extremely frightened, angry, excited, etc.: Calm down, you're getting hysterical. The police were accused of hysterical over-reaction. hysterical laughter (= uncontrolled laughter) informal extremely funny: His last film was hysterical.
hysterically
adverb uk   /-i/ us  
She started laughing/crying hysterically (= without control).
(Definition of hysterical from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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