DUMBFOUNDING is validvalid

DUMBFOUND, [v DUMBFOUNDED, DUMBFOUNDING, DUMBFOUNDS] : DUMBFOUNDINGLY [v]

167,440 of 196,601 in NWL2023·also valid in CSW24

DUMBFOUND, to strike dumb; to confuse with astonishment, also DUMBFOUNDER, DUMFOUND, DUMFOUNDER [v]