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blunder
A usually serious mistake typically caused by ignorance or confusion.
From Middle English blunderen, to go blindly, perhaps from Old Swedish blundra, have one's eyes closed, from Old Norse blunda.
Synonyms:
absurdity, bad job, boner, boo-boo, botch, blooper, bumble, bungle, dumb move, dumb trick, deviation, erratum, error, fault, failure, fall, fallacy, falsehood, falsity, fault, foul up, faux pas, flaw, fluff, gaff, gaffe, glitch, goof, howler, inaccuracy, lapse, misapprehension, misbelief, miscalculation, misconception, miscue, misdeed, misjudgment, mismanagement, miss, mistake, misstep, misunderstanding, offense, omission, oversight, screamer, screw-up, slip up, slight, slip, slipup, solecism, stumble, transgression, wrong, wrongdoing