Synonyms of unlettered

2 Syllables
unread, untaught, nescient
3 Syllables
unstudious, ignorant, know-nothing, unschooled, unlearned, lowbrowed
4 Syllables
unrefined, unscholarly, uninstructed, untutored, catachrestic, uncultured
5 Syllables
illiterate, unknowledgeable, uneducated, unintellectual
6 Syllables
unsophisticated