Urdummheit, absurdity, absurdness, big deal, blank mind, blankmindedness, blankness, brainlessness, bull, bunk, calm of mind, craziness, devilishness, devilment, devilry, deviltry, dottiness, elfishness, emptiness, emptiness of mind, empty-headedness, fallow mind, fatuity, flightiness, flimsiness, folly, frivolity, frivolousness, futility, giddiness, high spirits, idleness, ignorance, impishness, impracticality, imprudence, inanity, incapacity, indiscretion, ineptitude, injudiciousness, insanity, insensibility, irrationality, lackbrainedness, lackwittedness, levity, lightness, low IQ, ludicrousness, lunacy, mental blankness, mental weakness, mercuriality, mindlessness, mischief, mischievousness, nirvana, nonsense, nugacity, oblivion, passivity, playfulness, prankishness, pranksomeness, preposterousness, primal stupidity, puckishness, quietism, reasonlessness, ridiculousness, roguery, roguishness, scampishness, senselessness, shallowness, silliness, slackmindedness, slackwittedness, slenderness, slightness, sportiveness, superficiality, tabula rasa, thoughtfreeness, thoughtlessness, tranquillity, triflingness, triteness, triviality, trivialness, unintellectuality, unintelligence, unreasonableness, unwisdom, unwiseness, vacancy, vacuity, vanity, vapidity, volatility, waggery, waggishness, witlessness, youthful spirits