clandestine

Adjective
  1. Conducted with or marked by hidden aims or methods (synset 301710918)
    "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"
    similar to: covert - secret or hidden; not openly practiced or engaged in or shown or avowed
    same as: cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, surreptitious, undercover, underground

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