Meaning : As if struck dumb with astonishment and surprise.
Example :
A circle of policemen stood dumbfounded by her denial of having seen the accident.
The flabbergasted aldermen were speechless.
Was thunderstruck by the news of his promotion.
Synonyms : dumbfounded, dumbstricken, dumbstruck, dumfounded, stupefied, thunderstruck
Flabbergasted meaning in Bengali (Bangla).