absurdity, absurdness, act of folly, asininity, battiness, blunder, brainlessness, buffoonery, clownishness, crackpottedness, crankiness, craziness, daffiness, daftness, desipience, dottiness, dumb trick, dumbness, eccentricity, error, fatuity, fatuousness, faux pas, fluff, foolery, foolheadedness, foolishness, frivolity, frivolousness, gaffe, giddiness, goof, goofiness, idiocy, imbecility, imprudence, inanity, indiscretion, ineptitude, insanity, irrationality, kookiness, lunacy, madness, mindlessness, mistake, niaiserie, nonsense, nugacity, nuttiness, obtuseness, preposterousness, queerness, rashness, sappiness, screwiness, senselessness, silliness, sottise, stolidity, stolidness, stupid thing, stupidity, thoughtlessness, triflingness, triviality, unwise step, wackiness, weak-mindedness, weirdness, witlessness, zaniness, zanyism