stupefying

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”

making physically stupid or dull or insensible

• “a stupefying blow to the head”
• “the stupefying effects of hemp”

shocking with surprise and consternation

• “the stupefying impact of the tragedy”