Present participle; Past participle - dumbfounding - dumbfounded Present - dumbfound - dumbfound - dumbfounds - dumbfound - dumbfound - dumbfound Past - dumbfounded - dumbfounded - dumbfounded - dumbfounded - dumbfounded - dumbfounded Future - will dumbfound - will dumbfound - will dumbfound - will dumbfound - will dumbfound - will dumbfound Present conditional - would dumbfound - would dumbfound - would dumbfound - would dumbfound - would dumbfound - would dumbfound Present Perfect - have dumbfounded - have dumbfounded - has dumbfounded - have dumbfounded - have dumbfounded - have dumbfounded Past Perfect - had dumbfounded - had dumbfounded - had dumbfounded - had dumbfounded - had dumbfounded - had dumbfounded Future Perfect - will have dumbfounded - will have dumbfounded - will have dumbfounded - will have dumbfounded - will have dumbfounded - will have dumbfounded Past conditional - would have dumbfounded - would have dumbfounded - would have dumbfounded - would have dumbfounded - would have dumbfounded - would have dumbfounded Imperative - - - dumbfound - - - - - - - -