fatuity

absurdness, craziness, foolishness, inaneness, madness, senselessness, witlessness

buffoonery, monkeyshine(s), shenanigan(s), tomfoolery

drivel, humbug, nonsense, twaddle

blunder, bungle, flub, goof, howler

denseness, dim-wittedness, doltishness, dopiness, dullness (also dulness), dumbness, feeblemindedness, idiocy, mindlessness, oafishness, obtuseness, simplemindedness, simpleness, slowness, stupidity, stupidness, vacuity

fallacy, irrationality, unreasonableness

kookiness, weirdness

laughableness, ludicrousness, ridiculousness

feeblemindedness, simplemindedness

absurdity, asininity, balminess, craziness, daftness, dottiness, fatuousness, folly, idiocy, inaneness, inanity, insanity, lunacy, madness, nonsensicalness, nuttiness, preposterousness, silliness, wackiness, zaniness