blunder
Cross references: 1. error 1. blun.der \'bl*n-d*r\ \-d(*-)rin\ \-d*r-*r\ vb or blun.der.ing [ME blundren] 1: to move unsteadily or confusedly 2: to make a mistake through stupidity, ignorance, confusion, or carelessn ess 1: to utter stupidly, confusedly, or thoughtlessly 2: to make a stupid, careless, or thoughtless mistake in - blun.der.er n 2. blunder n : a gross error or mistake resulting from stupidity, ignorance, confusion, or carelessness