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"

knocked unconscious by a heavy blow

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"

Drunk.

A character becomes Stunned when he takes more STUN damage from a single attack than he has points of CON.

Condition A stunned creature drops everything held, can't take actions, takes a -2 penalty to AC, and loses his Dexterity bonus to AC (if any).