Pronunciation: (blun'dur),[key] —n. a gross, stupid, or careless mistake: That's your second blunder this morning.
—v.i. 1. to move or act blindly, stupidly, or without direction or steady guidance: Without my glasses I blundered into the wrong room. 2. to make a gross or stupid mistake, esp. through carelessness or mental confusion: Just pray that he doesn't blunder again and get the names wrong.
—v.t. 1. to bungle; botch: Several of the accounts were blundered by that new assistant. 2. to utter thoughtlessly; blurt out: He blundered his surprise at their winning the award.