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| тайно (sixthson); секретно (sixthson); скрыто (4uzhoj) | |||
| негласно (т.е. в ходе негласных следственных действий 4uzhoj); в ходе негласных следственных действий (4uzhoj) | |||
| при помощи спецслужб (только в контексте; пример: Blaming the Russians for leaking a conversation that was presumably obtained by covert means poses problems for the US, as documents leaked by Edward Snowden reveal that the US has in the past listened into the communications of its allies, as well as enemies. 4uzhoj) | |||