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English definition of “hysterical”

hysterical

adjective    /hɪˈster·ɪ·kəl/
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).
(Definition of hysterical adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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