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Verb: dumbfound  'dúm,fawnd or dúm'fawnd [N. Amer], dúm'fawnd [Brit]
  1. Confuse or leave at a loss because of something complex or difficult to understand
    "These questions dumbfound even the experts";
    - confuse, throw, fox, befuddle, fuddle, bedevil, confound, discombobulate [informal], perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, nonplus, gravel

Derived forms: dumbfounds, dumbfounded, dumbfounding

Type of: be