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undercover
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tajny (o agencie, śledztwie)
Did you know that he's an undercover agent?
The policeman took part in an undercover mission.
I think she's an undercover reporter and she's spying on me.
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dark
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confidential
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poufny, tajny
meant to be kept secret
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covert
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classified
The treatment of classified information has to be carefully considered.
That would give you access to level 6 classified material.
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clandestine
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cryptic
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privy
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hush-hush
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secree