Stunned is a negative status effect and a battle mechanic that appears in Sonic Chronicles: The Dark Brotherhood.
In gameplay, when a target is inflicted with Stunned, he/she cannot perform any actions during the round he/she was stunned or during the following round. Targets inflicted with Stunned are signified by white Z's emitting from the targets and that the targets in question seem to be sleeping standing upright.
Stunned can be inflicted on both playable characters and enemies when they are hit by certain attacks, such as POW moves or regular attacks (in the playable characters' case). It can be cured by Antidote or Cure All Spray.