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hysterical

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adjective American English pronunciation: hysterical /hɪˈsterɪk(ə)l/
  1. 2
    spoken extremely funny

    He didn't have a clue what was going on, and we all thought it was hysterical.

derived word

hysterically

 American English pronunciation: hysterically /hɪˈsterɪkli/  adverb

hysterically funny

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