← BackshareGuessdumbfound/dʌmˈfaʊnd/verbTo greatly surprise or shock someone so that they are speechless or confused.The complexity of the puzzle dumbfounded even the experts.The magician's trick dumbfounded the entire audience.Her sudden resignation dumbfounded her coworkers.SynonymsastonishstunamazeflabbergastperplexAntonymsbore