noun, noun which may take the genitive case particle 'no'
total illiteracy
Yojijukugo meaning complete inability to read or write; often used in formal or literary contexts to describe someone who is entirely illiterate.
彼は一文不通で、自分の名前すら書けない。
He is totally illiterate and cannot even write his own name.
昔の農村では一文不通の人が多かった。
In old farming villages, there were many people who were completely illiterate.
文盲 also means illiteracy but is more common and neutral; 一文不通 emphasizes total inability and is a yojijukugo with a literary feel.
Yojijukugo composed of 一 (one), 文 (writing/sentence), 不 (not), and 通 (pass/understand), literally 'not even one sentence passes through', meaning complete illiteracy. The exact historical origin is uncertain.