Definition of flabbergast in English:

flabbergast

verb

[with object]usually as adjective flabbergasted
informal
  • Surprise (someone) greatly; astonish.

    ‘this news has left me totally flabbergasted’
    • ‘I was flabbergasted afterwards to hear that they do eight shows a week.’
    • ‘When they arrived she said she was flabbergasted at reading the cover page on them.’
    • ‘And she is flabbergasted the police have said they cannot act against the owner because the dogs are not registered as dangerous.’
    • ‘He was flabbergasted at the total complexity of the question.’
    • ‘Brian was flabbergasted, but not really surprised, not on a subconscious level.’
    • ‘I am flabbergasted at the crassness of things said to, and about, him this past week.’
    • ‘Today Ms Morris said she was flabbergasted by the award.’
    • ‘On the other hand, I am utterly flabbergasted that, if the argument is valid, I have not heard about it.’
    • ‘I was flabbergasted to learn how much of our money is being wasted in this way.’
    • ‘After a long wait, we're flabbergasted to be announced winners.’
    • ‘Well, I'd just like to say that I'm completely flabbergasted and astounded.’
    • ‘I know there's a million puns to be had here, but I'm too flabbergasted to think of anything good.’
    • ‘When she told me just a few weeks before that she was going to leave, I was flabbergasted and heartbroken.’
    • ‘When I found out that I'd got the part I was absolutely flabbergasted.’
    • ‘This effect is so obvious to me that I'm flabbergasted at the smart people who can't see it.’
    • ‘Mrs Lewis said she was flabbergasted at some of what she said.’
    • ‘A shopkeeper was flabbergasted when he opened his mail to find an apology from a shoplifter, with a cheque for £75.’
    • ‘I was too flabbergasted to say anything, and later I felt guilty about that.’
    • ‘I am frankly flabbergasted that my complaints so far have proved so ineffectual.’
    • ‘I thought at first it must be a joke but apparently it's true and I am absolutely flabbergasted.’
    astonish, astound, amaze, surprise, startle, shock, take aback, take by surprise
    View synonyms

Origin

Late 18th century: of unknown origin.

Pronunciation

flabbergast

/ˈflabəɡɑːst/