noun
bureaucratic jargon; officialese; gobbledygook
Refers to the stiff, roundabout, or overly formal language used in government and official documents, often criticized for being hard to understand.
お役所言葉で書かれた通知は、一般の人にはわかりにくい。
Notices written in bureaucratic jargon are hard for ordinary people to understand.
彼はお役所言葉を避けて、わかりやすい表現を使うようにしている。
He tries to avoid officialese and use easy-to-understand expressions.
Compound of お (honorific prefix) + 役所 (government office) + 言葉 (language, words). The exact origin is uncertain, but it likely arose as a colloquial term criticizing the opaque language of officialdom.