The Collaborative International Dictionary of English v.0.48:
nonliterate \nonliterate\ adj. not using a writing system; -- of societies, cultures, or tribes. [Narrower terms: uncivilized (vs. civilized)] Syn: preliterate. [WordNet 1.5 +PJC]WordNet (r) 3.0 (2006):
nonliterate adj 1: used of a society that has not developed writing [syn: preliterate, nonliterate]