dumbfounded, dumfounded, flabbergasted, stupefied, thunderstruck, dumbstruck, dumbstricken
Meaning: as if struck dumb with astonishment and surprise; "a circle of policement stood dumbfounded by her denial of having seen the accident"; "the flabbergasted aldermen were speechless"; "was thunderstruck by the news of his promotion"
John read the note over and over in a dumbfounded way.
Then the headman was dumbfounded and reluctantly brought out five gold pieces and gave them to the woman.
If he was dumbfounded, the merchant, who was ushered into his presence soon after sunrise, was much more so.