An inability to understand.

Roget 491: ignorance, nescience, tabula rasa [Lat.], crass ignorance, ignorance crasse [Fr.]; unfamiliarity, unacquaintance^†; unconsciousness etc. adj.; darkness, blindness; incomprehension, inexperience, simplicity.    unknown quantities, x, y, z.    sealed book, terra incognita, virgin soil, unexplored ground; dark ages.    [Imperfect knowledge] smattering, sciolism^†, glimmering, dilettantism; bewilderment etc. (uncertainty) 475; incapacity.    [Affectation of knowledge] pedantry; charlatanry, charlatism^†; Philister^†, Philistine.    ... show more

Dutch: onbegrip, wanbegrip
Polish: niezrozumienie