(n.) Weakness or imbecility of mind; stupidity.

absurdity aimlessness asininity battiness blank mind blankmindedness blankness bootlessness brainlessness buffoonery calm of mind clownishness counterproductiveness counterproductivity crackpottedness crankiness craziness daffiness desipience eccentricity emptiness emptiness of mind empty-headedness failure fallow mind fatuousness fecklessness folly foolery foolheadedness foolishness frivolity frivolousness fruitlessness futility giddiness goofiness hollowness idiocy imbecility impotence inanity ineffectiveness ineffectuality ineffectualness inefficaciousness inefficacy ineptitude insanity invalidity lunacy madness meaninglessness mental blankness mindlessness niaiserie nirvana nugacity nuttiness oblivion otiosity passivity pointlessness profitlessness purposelessness queerness quietism rat race sappiness screwiness senselessness silliness stupidity tabula rasa the absurd thoughtfreeness thoughtlessness tranquillity triflingness triviality unintelligence unproductiveness unprofitability unprofitableness uselessness vacancy vacuity valuelessness vanity vicious circle wackiness weirdness witlessness worthlessness zaniness zanyism