Stupefied
WordNet
adjective
(1) In a state of mental numbness especially as resulting from shock
"He had a dazed expression on his face"
"Lay semiconscious, stunned (or stupefied) by the blow"
"Was stupid from fatigue"
(2) 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"