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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"
excited by sudden surprise or alarm and making a quick involuntary movement; "students startled by the teacher's quiet return"; "the sudden fluttering of the startled pigeons"; "her startled expression"