Although the common definition of illiterate is unable to read and write, at least one dictionary also defines it (https://www.dictionary.com/browse/illiterate

Although the common definition of illiterate is unable to read and write, at least one dictionary also defines it (https://www.dictionary.com/browse/illiterate https://www.dictionary.com/browse/illiterate) also being used as having very little or no education or/and showing lack of culture.