(n.) Absence or lack of intelligence; unwisdom; ignorance.

agnosticism blank mind blankmindedness blankness callowness calm of mind childishness emptiness of mind empty-headedness fallow mind fatuity foolishness greenhornism greenness hiatus of learning ignorance ignorantism ignorantness immaturity imprudence inability inadeptness inadequacy inadvisability inanity inaptitude inaptness inattention inattentiveness incapability incapacity incompetence incompetency inconsideration indexterity indiscreetness indiscretion ineffectiveness ineffectuality inefficiency ineptness inexpedience inexperience injudiciousness innocence irrationality know-nothingism knowledge-gap lack of information maladjustment maladroitness mediocrity mental blankness nescience nirvana oblivion obscurantism passivity pedestrianism pompousness puerility quietism rawness reasonlessness recklessness rustiness senselessness simpleness simplicity skill-lessness stuffiness tabula rasa thoughtfreeness thoughtlessness tranquillity unacquaintance unaptness uncleverness undeftness undexterousness undextrousness unfamiliarity unfitness unfittedness unknowing unknowingness unproficiency unreason unreasonableness unripeness unschooledness unsensibleness unskillfulness unsoundness unthoughtfulness untrainedness unwisdom unwiseness vacancy vacuity vacuousness witlessness