Толковый словарь английского языка - blunder

I. verb (~ed; ~ing) Etymology: Middle English blundren, probably of Scandinavian origin; akin to Old Norse blunda to shut one's eyes, doze, Norwegian dialect blundra Date: 14th century intransitive verb to move unsteadily or confusedly, to make a mistake through stupidity, ignorance, or carelessness, transitive verb to utter stupidly, confusedly, or thoughtlessly, to make a stupid, careless, or thoughtless mistake in, ~er noun ~ingly adverb II. noun Date: 1693 a gross error or mistake resulting usually from stupidity, ignorance, or carelessness, see: error