Uneducated
Part of speech: adjective
Definition: not educated
Example sentence: Since my retirement, I've spent a lot of time trying to help the School of Social Work at the University of North Carolina. A society like this just can't afford an uneducated underclass of citizens.
Unlettered
Part of speech: adjective
Definition: not instructed in letters; not well educated; unable to readnot expressed in or marked with letters