(n.) Want of knowledge; ignorance; agnosticism.

agnosticism blankmindedness callowness empty-headedness greenhornism greenness hiatus of learning ignorance ignorantism ignorantness inanity inexperience innocence know-nothingism knowledge-gap lack of information obscurantism rawness simpleness simplicity tabula rasa unacquaintance unacquaintedness unawareness unfamiliarity unintelligence unknowing unknowingness unripeness vacuity vacuousness