Definition of flabbergasted adjective from the Oxford Advanced American Dictionary

     

    flabbergasted

     adjective
    adjective
    NAmE//ˈflæbərˌɡæstəd//
     
    [not usually before noun](informal)
     
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  1. 1extremely surprised and/or shocked synonym astonished
  2. 2 Friends were flabbergasted by the news that they'd split up. She was too flabbergasted to speak.
See the Oxford Advanced Learner's Dictionary entry: flabbergasted