adjective
1. so surprisingly impressive as to stun or overwhelm (Freq. 1)
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such an enormous response was astonishing
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an astounding achievement
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the amount of money required was staggering
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suffered a staggering defeat
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the figure inside the boucle dress was stupefying
• Syn: ↑astonishing, ↑astounding, ↑staggering
• Similar to: ↑impressive
2. making physically stupid or dull or insensible
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a stupefying blow to the head
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the stupefying effects of hemp
• Similar to: ↑disorienting
3. shocking with surprise and consternation
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the stupefying impact of the tragedy
• Similar to: ↑alarming
Useful english dictionary. 2012.