厳げん秘ぴ

noun, noun which may take the genitive case particle 'no'

strict secret; top-secret

Used for information that must be kept strictly confidential, often in official or formal contexts.

• この書しょ類るいは厳げん秘ぴ扱あつかいです。

  This document is treated as top-secret.

• 厳げん秘ぴ事じ項こうなので、外がい部ぶに漏もらさないでください。

  This is a strictly confidential matter, so please do not disclose it to outsiders.