WordReference Random House Learner's Dictionary of American English © 2015
flab•ber•gast /ˈflæbɚˌgæst/USA pronunciation v. [+ object]

    to overcome with surprise and bewilderment;
    astound:The news of his promotion flabbergasted me.

Collins Concise English Dictionary © HarperCollins Publishers::

flabbergast /ˈflæbəˌɡɑːst/ vb (transitive)
  1. informal to overcome with astonishment; amaze utterly; astound
Etymology: 18th Century: of uncertain origin

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