present participle of astonish
"The astonishing result of the experiment surprised everyone in the lab."
surprising greatly
"she does an amazing amount of work"
"the dog was capable of astonishing tricks"
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"
Causing astonishment.
"The magician's ability to make the entire audience vanish was truly astonishing."