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hysterical

adjective
 
 
/hɪˈster.ɪ.kəl/

Definition

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)Becoming too excited and easily upsetMental and psychiatric disorders informal extremely funny: His last film was hysterical.Humour and humorous hysterically
 
 
/-i/ adverb
She started laughing/crying hysterically (= without control).Becoming too excited and easily upsetMental and psychiatric disorders
(Definition of hysterical adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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