Entry 1 sense Webster, 1913 dumbfound · IPA /ˈdʌm.faʊnd/ 01 v. t. same as dumfound. 1. same as dumfound. See: dumfound Syn. confuse, perplex, throw, fox, befuddle, fuddle, bedevil, puzzle, mystify, baffle, bewilder, flummox, stupefy, stupify, nonplus, gravel, amaze, trounce, confound, be confusing to, make confused.