noun
dead letter; unenforced law
Refers to a law or regulation that is still on the books but no longer enforced or observed.
その法律はもはや死文と化している。
That law has become a dead letter.
noun
meaningless writing; empty words
Describes a text or statement that has no real effect or substance, often used for formal documents or promises that are ignored.
彼の約束は結局死文に終わった。
His promise ended up being just empty words.