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Verb: dumbfound  dúm'fawnd
  1. Be a mystery or bewildering to
    - perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, stupefy, nonplus, gravel, amaze

Derived forms: dumbfounds, dumbfounding, dumbfounded

Type of: bedevil, befuddle, confound, confuse, discombobulate, fox, fuddle, throw