astonishing
1. [ adjective ] surprising greatly
Synonyms: amazing
Examples:

"she does an amazing amount of work" "the dog was capable of astonishing tricks"

Related terms: surprising
2. [ adjective ] so surprisingly impressive as to stun or overwhelm
Synonyms: staggering stupefying astounding
Examples:

"such an enormous response was astonishing" "an astounding achievement" "the amount of money required was staggering" "a staggering defeat" "the figure inside the boucle dress was stupefying"

Related terms: impressive
Similar spelling:   astonishingly
  astonish
  astonished
  astounding
  astonishment
  astonied