/ Dictionary / Index A astound: Meaning and Definition of Find definitions for: as•tound Pronunciation: (u-stound'), [key] — v.t. to overwhelm with amazement; astonish greatly; shock with wonder or surprise. —adj. astonished; astounded. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: astound (Thesaurus) Astor astounding Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language