bêtise

a foolish act or idea writing a sequel to a Jane Austen novel must be regarded as a literary bêtise of the highest order Synonyms absurdity, asininity, folly, fatuity, foolery, foppery, idiocy, imbecility, inanity, insanity, lunacy, stupidityRelated Words absurdness, craziness, foolishness, inaneness, madness, senselessness, witlessness; buffoonery, monkeyshine(s), shenanigan(s), tomfoolery; drivel, humbug, nonsense, twaddle; blunder, bungle, flub, goof, howlerNear Antonyms discretion, forethought, prudence, sagacity, wisdom; brainstorm, inspiration