Definitions for unletteredʌnˈlɛt ərd
Random House Webster's College Dictionary
uneducated; untutored; ignorant.
not marked with letters, as a tombstone.
Origin of unlettered:
having little acquaintance with writing
"special tutorials to assist the unlettered sector of society"
ignorant, nescient, unlearned, unlettered(adj)
uneducated in general; lacking knowledge or sophistication
"an ignorant man"; "nescient of contemporary literature"; "an unlearned group incapable of understanding complex issues"; "exhibiting contempt for his unlettered companions"
not instructed in letters; not well educated; unable to read
not expressed in or marked with letters