私し信しん

noun

private letter; personal message

Refers to a letter or message intended for a specific individual, not for public or official use. Can be used for both physical letters and digital messages.

• これは私し信しんですから、他ほかの人ひとに見みせないでください。

  This is a private letter, so please don't show it to others.

• 会かい社しゃのメールアドレスで私し信しんを送おくるのは避さけるべきだ。

  You should avoid sending personal messages from your company email address.

noun

secret correspondence; confidential report

Emphasizes the confidential nature of the communication, often used in contexts like diplomacy, business, or military where secrecy is important.

• その外がい交こう官かんは本ほん国ごくに私し信しんを送おくった。

  The diplomat sent a confidential report to his home country.