furtive


furtive (http://definr.com/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]