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informal (esp of official work, documents, etc) secret; confidential
highly secret or confidential.
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|Adj.||1.||hush-hush - conducted with or marked by hidden aims or methods; "clandestine intelligence operations"; "cloak-and-dagger activities behind enemy lines"; "hole-and-corner intrigue"; "secret missions"; "a secret agent"; "secret sales of arms"; "surreptitious mobilization of troops"; "an undercover investigation"; "underground resistance"|
clandestine, cloak-and-dagger, undercover, underground, hole-and-corner, hugger-mugger, secret, surreptitious
covert - secret or hidden; not openly practiced or engaged in or shown or avowed; "covert actions by the CIA"; "covert funding for the rebels"