subliterate

adjective

sub·​lit·​er·​ate ˌsəb-ˈli-tə-rət 

 also  -ˈli-trət

: less than fully literate : able to read or write only at a low level

help for subliterate students

subliterate noun

plural subliterates

Here, on the other hand, we have a tale about a subhuman apparently intended for subliterates.

—People Weekly

Word History

First Known Use

1912, in the meaning defined above