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| behind backs (Brücke); darkly; under hand; in hidlings; hugger-mugger; mystically; occultly; in petto; in secrecy; with secrecy; in secret; secretly; surreptitiously; underground; underhand; behind the back (of); by stealth; in a hugger-mugger way; on the sly; stealthily; under the rose | |||
| in strict confidence | |||
| within four walls | |||
| confidential | |||
| secret (гриф документа); confidential (security classification, гриф секретності) | |||
| таємно: 58 phrases in 10 subjects |
| Bookish / literary | 1 |
| Diplomacy | 6 |
| General | 23 |
| Informal | 6 |
| Information technology | 1 |
| International Monetary Fund | 1 |
| Law | 9 |
| Military | 9 |
| Obsolete / dated | 1 |
| United States | 1 |