Definition of flabbergasted adjective from the Oxford Advanced Learner's Dictionary

 

flabbergasted

 adjective
adjective
BrE BrE//ˈflæbəɡɑːstɪd//
 
; NAmE NAmE//ˈflæbərɡæstɪd//
 
[not usually before noun](informal) Surprise
 
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extremely surprised and/or shocked synonym astonished Friends were flabbergasted by the news that they’d split up. She was too flabbergasted to speak. See related entries: Surprise Word Origin late 18th cent.: of unknown origin.
See the Oxford Advanced American Dictionary entry: flabbergasted