不ふ悉しつふしつMeanings1nounVery Sincerely YoursarchaicArchaic formal closing phrase used in letters, similar to 'Yours sincerely' or 'Very sincerely yours'. Not used in modern Japanese correspondence.昔むかしの手て紙がみの末まつ尾びには「不ふ悉しつ」と書かかれることがあった。In old letters, '不悉' was sometimes written at the end.