covert action; covert operations
Refers to secret or undercover activities, often in military, intelligence, or espionage contexts.
The organization excels at covert operations.
The details of the covert action were not disclosed.
秘密工作 emphasizes secret maneuvers or underhanded plotting, while 隠密行動 focuses on the operational aspect of staying hidden.
諜報活動 specifically refers to intelligence-gathering activities, whereas 隠密行動 is broader and can include any covert operation.
Compound of 隠密 (secret, stealth) and 行動 (action, behavior). The exact historical derivation is uncertain, but the term is used in modern Japanese for covert operations.