expression
sincerely yours; I'll write again soon
Archaic epistolary closing used in formal letters, similar to 'sincerely yours' or 'more anon'. Cross-referenced with 不尽.
See also: 不尽
昔の手紙の末尾には「不宣」と書かれることがあった。
In old letters, '不宣' was sometimes written at the end.