noun
a person who is unable to read or write
adjective
lacking the ability to read or write
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The government is working on programs to reduce the number of illiterate adults in the country.
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It's sad that some people are illiterate and can't read or write.
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I can't believe he's so illiterate, he can't even spell simple words correctly.
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Being illiterate in the digital age is like being lost in a foreign land without a map.