dumbfound [dumbfounded, dumbfounding, dumbfounds](to confuse and bewilder) verb [UK: dʌm.ˈfaʊnd] [US: ˈdəm.faʊnd]Witnesses were left dumbfounded, unable to comprehend how he simply vanished into thin air. = I testimoni sono rimasti sbigottiti, incapaci di comprendere come abbia semplicemente fatto a svanire nel nulla.