Unliterate

[Agnes]

A person who appears to know how to [read] and/or write however refuses to do so either knowingly or unknowingly.
Absolutely no relation to the word [illiterate] and not to be confused with someone who cant understand or [use a dictionary].

[Dave Paprocki]

Unable to read or write, illiterate (now rare). Later, more generally: unacquainted with, or uninterested in, literature or writing; characterized by a lack of learning or education; unliterary. Also as noun (with the): illiterate or unliterary people as a class.