stunned in WordNet English dictionary

1. filled with the emotional impact of overwhelming surprise or shock
   "an amazed audience gave the magician a standing ovation"; "I stood enthralled, astonished by the vastness and majesty of the cathedral"; "astounded viewers wept at the pictures from the Oklahoma City bombing"; "stood in stunned silence"; "stunned scientists found not one but at least three viruses"
   amazed  astonied  astonished  astounded  stunned 
   
2. in a state of mental numbness especially as resulting from shock
   "he had a dazed expression on his face"; "lay semiconscious, stunned (or stupefied) by the blow"; "was stupid from fatigue"
   dazed  stunned  stupefied  stupid 
   
3. knocked unconscious by a heavy blow
   knocked out  kayoed  KO'd  out  stunned