Illiterate is a term used to describe someone who is unable to read or write. The crossword solutions for this term include 'IDIOT' (5 letters), 'UNLETTERED' (10 letters), 'BENIGHTED' (9 letters), 'UNTUTORED' (9 letters), 'UNTAUGHT' (8 letters), 'UNLEARNED' (9 letters), 'UNCULTURED' (10 letters), 'UNSCHOOLED' (10 letters), 'UNENLIGHTENED' (13 letters), 'UNEDUCATED' (10 letters), 'UNINSTRUCTED' (12 letters), 'IGNORANT' (8 letters), 'RUDE' (4 letters), and 'unread' (6 letters). These words all describe someone who is lacking in knowledge, education, or understanding, and can be used to refer to someone who is illiterate.