1. (n.) The quality of being foolish.

2. (n.) A foolish practice; an absurdity.

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