NTUMC+ Open Multilingual Wordnet 0.9

秘密, 极秘密, 秘密地, 机密+的, 地下, 秘密+的, 机密, 暗地里, 暗中, 暗地里+的

secret, clandestine, undercover, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, surreptitious, underground

conducted with or marked by hidden aims or methods

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Japanese	Yue Chinese	Malaysian