Blunder :: Blunder (n.) A gross error or mistake, resulting from carelessness, stupidity, or culpable ignorance..
Blunderbuss :: Blunderbuss (n.) A short gun or firearm, with a large bore, capable of holding a number of balls, and intended to do execution without exact aim..
Blunderbuss :: Blunderbuss (n.) A stupid, blundering fellow..