say it: uh-STAH-ni-shing-lee
astonishingly is an adverb meaning "in an amazing manner; to everyone's surprise". It carries one recorded sense.
in an amazing manner; to everyone's surprise
“amazingly, he finished medical school in three years”
Definitions, synonyms and semantic relations for astonishingly 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.