fur·tive /ˈfɝtɪv/
  (a.)私下的,祕密的,隱密的,偷偷摸摸的
  Fur·tive a.  Stolen; obtained or characterized by stealth; sly; secret; stealthy; as, a furtive look.
     A hasty and furtive ceremony.   --Hallam.
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  furtive
       adj 1: marked by quiet and caution and secrecy; taking pains to
              avoid being observed; "a furtive manner"; "a lurking
              prowler"; "a sneak attack"; "stealthy footsteps"; "a
              surreptitious glance at his watch"; "someone skulking
              in the shadows" [syn: lurking, skulking, sneak(a),
               sneaky, stealthy, surreptitious]
       2: secret and sly or sordid; "backstairs gossip"; "his low
          backstairs cunning"- A.L.Guerard; "backstairs intimacies";
          "furtive behavior" [syn: backstair, backstairs]