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Adjective: surreptitious  ,sur-up'ti-shus [N. Amer], ,sú-rup'ti-shus [Brit]
  1. Marked by quiet and caution and secrecy; taking pains to avoid being observed
    "a surreptitious glance at his watch";
    - furtive, sneak, sneaky, stealthy
  2. Conducted with or marked by hidden aims or methods
    "surreptitious mobilization of troops";
    - clandestine, cloak-and-dagger, hole-and-corner, hugger-mugger, hush-hush, secret, undercover, underground

See also: concealed, covert