不ふ文ぶん

noun which may take the genitive case particle 'no'

unwritten; not written down

Used in formal or legal contexts to describe rules, customs, or agreements that are not codified in writing. Often appears in the phrase 不文律 (unwritten rule).

• その会かい社しゃには不ふ文ぶん律りつがいくつかある。

  That company has several unwritten rules.

noun which may take the genitive case particle 'no'

illiterate; uneducated

Rare and somewhat dated; refers to a person who cannot read or write, or more broadly to someone lacking formal education. Modern Japanese more commonly uses 文盲 or 無学.

• 昔むかしは不ふ文ぶんの人ひとが多おおかった。

  In the past, there were many illiterate people.

noun

poor writing; bad composition

Refers to writing that is clumsy, poorly composed, or lacking in literary merit. This sense is uncommon and somewhat literary.

• 彼かれのレポートは不ふ文ぶんで読よみにくい。

  His report is poorly written and hard to read.