illiterate

Concise Oxford English Dictionary © 2008 Oxford University Press:
illiterate /ɪˈlɪt(ə)rət/

▶adjective

• 1 unable to read or write.

• 2 ignorant in a particular subject or activity: politically illiterate.

▶noun a person who is unable to read or write.

– phrases
functionally illiterate lacking the literacy necessary for coping with most jobs and daily situations.

– derivatives
illiteracy noun,
illiterately adverb,
illiterateness noun.