astounding

(verb) affect with wonder. Synonyms: amaze, astonish, astound. Example: "Your ability to speak six languages amazes me!."

(adj) bewildering or striking dumb with wonder. Synonyms: dumbfounding, dumfounding.

(adj) so surprisingly impressive as to stun or overwhelm. Synonyms: astonishing, staggering, stupefying. Examples: "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."