1

In mails these are usually written when it's a personal/private matter.

But is there any difference in usage? Like in Case X you should use 私用 or in Case Y use 私情.

What would be the proper usage for each term?

2

私用 is a no-adjective, 私的 is a na-adjective, and 私情 is a simple noun.

  • 私用のメール means private/personal mails only in the sense of "unrelated to the business".
  • 私的なメール also refers to the same thing, but it tends to have a connotation of "sensitive/secret".
  • [×]私情のメール / [×]私情なメール doesn't make sense.
  • 私情が入ったメール/私情のこもったメール: a subjective mail that is biased by someone's personal feelings; a (business) mail which is interfered by one's personal feelings

When a manager of a company says "Don't send private emails when you are at work", they can say both 私用のメールを出さないでください and 私的なメールを出さないでください interchangeably.

You cannot use 私用 in sentences like 「私的なメールを見られなくないので、パスワードをかけています」「サーバーが攻撃され、たくさんの人の私的な写真が流出してしまった」.

  • How about when used in mails like: 私用のため遅れます、私的のため遅れます、私情のため遅れます? I've seen all of these used this way. – Y12K Apr 4 '17 at 4:54
  • 私用のため遅れます makes perfect sense, but other two sentences are wrong both grammatically and semantically. – naruto Apr 4 '17 at 4:55
  • I see. How about 私事都合? Would that be different from 私用? – Y12K Apr 4 '17 at 4:56
  • 2
    私事【しじ】都合 is a stiff way of saying 私用 or "for personal reasons" in formal letters. – naruto Apr 4 '17 at 5:01

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