Stolen; obtained or characterized by stealth; sly; secret; stealthy; as, a furtive look
disapproval If you describe someone's behaviour as furtive, you disapprove of them behaving as if they want to keep something secret or hidden. With a furtive glance over her shoulder, she unlocked the door and entered the house. behaving as if you want to keep something secret = secretive (furtif, from fur )
secret and sly or sordid; "backstairs gossip"; "his low backstairs cunning"- A L Guerard; "backstairs intimacies"; "furtive behavior"
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"