clandestine cloak-and-dagger hole-and-corner hugger-mugger hush-hush secret surreptitious undercover underground
clandestine%5:00:00:covert:00 cloak-and-dagger%5:00:00:covert:00 hole-and-corner%5:00:00:covert:00 hugger-mugger%5:00:00:covert:00 hush-hush%5:00:00:covert:00 secret%5:00:01:covert:00 surreptitious%5:00:00:covert:00 undercover%5:00:00:covert:00 underground%5:00:00:covert:00
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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