error 0 antonyms and opposites of error. Noun — A mistake, especially one made unintentionally. Synonyms for error aberration bloomer blooper blunder boner boo-boo break clanger cock-up fault faux pas floater flub fluff gaffe goof howler inaccuracy lapse lapsus mess-up misstep mistake oopsy screwup slip slip-up slipup stumble thinko wrength solecism erroneity err ← Back to the full definition of error