bù​chéng​wén

unwritten

不成文 bù​chéng​wén
unwritten
not written down; established by custom or habit rather than formal documentation
unable to weave a pattern
(literary) unable to weave threads into a pattern or fabric
lacking literary form
(of writing) poorly written or lacking structure; failing to form a coherent piece of literature or prose

Frequency

Written text
0.887 per million

Sources

Frequency data
BCC Corpus (BLCU)