fatuity

1 a foolish act or idea building another mall in an area that seems to already have a surplus of them seems like a gross fatuity Synonyms absurdity, asininity, bêtise, folly, 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

2 lack of good sense or judgment the fatuity of the homeowner who used gasoline to burn a pile of brushwood Synonyms absurdity, asininity, balminess, brainlessness, craziness, daftness, dippiness, dottiness, foolishness, fatuousness, folly, imbecility, inanity, insanity, lunacy, madness, nonsensicalness, nuttiness, preposterousness, senselessness, silliness, simplicity, unwisdom, wackiness, witlessness, zaninessRelated Words denseness, dim-wittedness, doltishness, dopiness, dullness (also dulness), dumbness, feeblemindedness, gormlessness [chiefly British], idiocy, mindlessness, oafishness, obtuseness, simplemindedness, simpleness, slowness, stupidity, stupidness, vacuity; fallacy, irrationality, unreasonableness; kookiness, weirdness; laughableness, ludicrousness, ridiculousnessNear Antonyms logicality, logicalness, rationality, rationalness, reasonability, reasonableness, validity; discernment, insight, perception, percipienceAntonyms prudence, sagaciousness, sagacity, sageness, sanity, sapience, sensibleness, soundness, wisdom

3 the quality or state of lacking intelligence or quickness of mind the stupidity of the characters on that TV sitcom is probably nothing in comparison to the fatuity of its creators Synonyms boneheadedness, brainlessness, denseness, density, dim-wittedness, doltishness, dopiness, dorkiness, dullness (also dulness), dumbness, stupidity, foolishness, gormlessness [chiefly British], mindlessness, oafishness, obtuseness, senselessness, simpleness, slowness, stupidness, thickness, vacuity, weak-mindedness, witlessnessRelated Words feeblemindedness, simplemindedness; absurdity, asininity, balminess, craziness, daftness, dippiness, dottiness, fatuousness, folly, idiocy, inaneness, inanity, insanity, lunacy, madness, nincompoopery, nonsensicalness, nuttiness, preposterousness, silliness, simplicity, wackiness, zaniness; fallacy, irrationality, unreasonableness; mental deficiency, mental retardationNear Antonyms acumen, alertness, astuteness, discernment, insight, judgment (or judgement), perception, percipience, perspicacity; sagacity, sageness, sapience, wisdom, wit; logicality, logicalness, rationality, rationalness, reasonableness, soundness, validityAntonyms braininess, brightness, brilliance, cleverness, intelligence, keenness, quickness, quick-wittedness, sharpness, smartness