Synset

so surprisingly impressive as to stun or overwhelm
<adj.all>   freq. cnt.: 2 freq. cnt.: 1 freq. cnt.: 1

astonishing

astounding

staggering

stupefying

sample sentences

"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"