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.
source: WordNet 3.0
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.
