#1 stupefying s. [astonishing, astounding, staggering] so surprisingly impressive as to stun or overwhelm; "such an enormous response was astonishing"; "an astounding achievement"; "the amount of money required was staggering"; "suffered a staggering defeat"; "the figure inside the boucle dress was stupefying. wn
#2 stupefying s. shocking with surprise and consternation; "the stupefying impact of the tragedy". wn
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