Breadcrumb Home > Dictionary > Index A astonishing: Meaning and Definition of Find definitions for: as•ton•ish•ing Pronunciation: (u-ston'i-shing), [key] — adj. causing astonishment or surprise; amazing: an astonishing victory; an astonishing remark. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: astonishing (Thesaurus) astonish astonishment ✖ Related Content Daily Word Quiz: tatterdemalion Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language