문맹이 · 문맹을
illiteracy; illiterate person
Example
한글 덕분에 한국의 문맹률은 매우 낮습니다.
Thanks to Hangeul, Korea's illiteracy rate is very low.
Word parts
문 writing+맹 blind
Literally 'blind to writing'.
Good to know
-맹 forms playful words like 컴맹, someone hopeless with computers.