WordWeb Online

1. Make dull or stupid or muddle with drunkenness or infatuation
   - besot
    
2. Be confusing or perplexing to; cause to be unable to think clearly
   "These questions stupefy even the experts";
   - confuse, throw, fox, befuddle, fuddle, bedevil, confound, discombobulate, perplex, vex, stick, get, puzzle, mystify, baffle, beat, pose, bewilder, flummox, nonplus, gravel, dumbfound
    
3. Make senseless or dizzy by or as if by a blow
   "stupefy fish";
   - stun

Derived forms: stupefied, stupefies, stupefying

Type of: be, desensitise [Brit], desensitize, immobilise [Brit], immobilize