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Adjective: furtive  fur-tiv
  1. Marked by quiet and caution and secrecy; taking pains to avoid being observed
    "a furtive manner";
    - sneak, sneaky, stealthy, surreptitious
     
  2. Secret and sly or sordid
    "furtive behaviour";
    - backstair, backstairs

See also: concealed, covert

Encyclopedia: Furtive