astonishing

(s) surprising greatly
- she does an amazing amount of work
- the dog was capable of astonishing tricks
amazing,
(s) 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
staggering, stupefying, astounding,

amazing staggering stupefying astounding

astonishingly