TOEFL dumbfound Definition to astonish or bewilder someone greatly. Example "The magician's final trick completely dumbfounded the audience." Sign in to save TOEFL Quiz → ← dumb dump → Study tips featuring "dumbfound" Map Each Word Into a Connected Network Track How TOEFL Words Behave With Others Group TOEFL Words Around Academic Themes Related words TOEFL brighten GRE abash GRE abate GRE abbreviate GRE abbreviation SAT abdicate GRE abduct SAT abet GRE abhor GRE abide SAT abject TOEFL ablaze