Translation guide
A report containing secret or sensitive information, not for public disclosure. In Japanese, this is commonly expressed with terms like 内密の報告 or 機密報告, but natural phrasing often depends on context.
This confidential report is for internal use only.
A compound noun meaning 'confidential report', often used in formal or corporate contexts. 機密 implies classified or secret information.
I prepared a confidential report.
Uses 秘密 (secret) instead of 内密. Slightly more direct, but still natural.
I submitted a confidential report to my boss.
A document or file explicitly labeled 'confidential', often as a security classification.
極秘 means 'top secret' or 'highly confidential'. Adding の報告書 makes it 'a report marked top secret'. This is common for classified documents.
The report was marked 'top secret'.
部外秘 means 'confidential' (literally 'outside the department secret'). Often stamped on internal documents.
This report is confidential.
A report leaked or disclosed secretly, often to the press.
Specifically refers to a whistleblower's report. 内部告発 means 'whistleblowing' or 'internal disclosure'.
The confidential whistleblower report was leaked to the media.
Directly translating 'confidential report' as コンフィデンシャルレポート is not natural in Japanese. Use the native terms above.