厳秘

げんぴ
strict secret
top-secret

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げんぴ【厳秘】

strict [absolute] secrecy; a carefully guarded [closely kept] secret.

●「厳秘」と表記した書状 a letter marked “Top Secret” [“Strictly Confidential”]; a letter marked “Classified.”

●厳秘に付する keep 《a matter》 a strict secret [strictly secret]; hold in strict confidence

・事の真相は厳秘に付されている. Strict secrecy is being observed as to the truth of the matter.

厳秘公報 a top-secret official report.