unable to read and write

an illiterate group.

having or demonstrating very little or no education.

showing lack of culture, esp. in language and literature.

displaying a marked lack of knowledge in a particular field

He is musically illiterate.

an illiterate person.

adjective

able , educated , learned , literate , taught

adjective

benighted , catachrestic , ignorant , inerudite , solecistic , uneducated , unenlightened , ungrammatical , uninstructed , unlearned , unlettered , unread , unschooled , untaught , untutored , nescient