letterless
/ˈlɛtələs/adjective
1Of a person or group of people: unacquainted with letters or literature; illiterate, uneducated.
2Having no letters or correspondence; characterized by a lack of post or mail.
3Not marked or inscribed with letters; having no letters.
noun
Illiterate or uneducated people considered collectively. Now rare.
Origin
Late 16th century (in an earlier sense). From letter + -less.