illiterate (adj.)

early 15c., "uneducated, unable to read and write" (originally meaning Latin), from Latin illiteratus "unlearned, unlettered, ignorant; without culture, inelegant," from assimilated form of in- "not, opposite of" (see in- (1)) + literatus "educated," literally "furnished with letters" (see literate). Old English used unstæfwis as a loan-translation of Latin illiteratus. As a noun meaning "illiterate person" from 1620s. Hence, illiterati (1788, Horace Walpole).

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Definitions of illiterate from WordNet
illiterate (adj.)
not able to read or write;
illiterate (adj.)
uneducated in the fundamentals of a given art or branch of learning; lacking knowledge of a specific field;
he is musically illiterate
Synonyms: ignorant
illiterate (adj.)
lacking culture, especially in language and literature;
illiterate (n.)
a person unable to read;
Synonyms: illiterate person / nonreader