Synonyms and Antonyms of astound

  1. to make a strong impression on (someone) with something unexpected <it astounds me that you flew all the way out here just for my birthday> Synonyms amaze, astonish, surprise, bowl over, dumbfound (also dumfound), flabbergast, floor, rock, shock, startle, stun, stupefy, thunderstrikeRelated Words befuddle, bewilder, blindside, blow away, confound, confuse, daze, discomfit, disconcert, dismay, jar, muddle, nonplus, perplex, shake up

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