clandestine

adjective

conducted with or marked by hidden aims or methods
隠された目的または方法で行われる、あるいは特徴とされる
- clandestine intelligence operations
  秘密の諜報活動
- cloak-and-dagger activities behind enemy lines
  敵陣の後ろの諜報活動
- hole-and-corner intrigue
  陰険な陰謀
- secret missions
  秘密の任務
- a secret agent
  諜報部員
- secret sales of arms
  兵器の秘密の販売
- surreptitious mobilization of troops
  軍の秘密の動員
- an undercover investigation
  おとり捜査
- underground resistance
  地下抵抗

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