say it: uh-STAH-ni-shing
astonishing is an adjective meaning "surprising greatly". It carries 2 recorded senses.
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”
Definitions, synonyms and semantic relations for astonishing come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.