Synonyms of know-nothing

2 Syllables
unread, untaught, lowbrow
3 Syllables
unlearned, benighted, unschooled, ignorant
4 Syllables
empty-headed, uncultured, uninstructed, unlettered, untutored, ignoramus, unrefined
5 Syllables
inerudite, uneducated, illiterate, uncultivated