Clandestine
[adj] 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"
Related Information
Related Terms
back-door, backstairs, covert, feline, furtive, hidlings, hole-and-corner, hugger-mugger, privy, quiet, shifty, skulking, slinking, slinky, sly, sneaking, sneaky, stealthy, surreptitious, undercover, underground, underhand, underhanded, under-the-counter,