furtive, sneak, sneaky, stealthy, surreptitious -- (marked by quiet and caution and secrecy; taking pains to avoid being observed; "a furtive manner"; "a sneak attack"; "stealthy footsteps"; "a surreptitious glance at his watch")
backstair, backstairs, furtive -- (secret and sly or sordid; "backstairs gossip"; "his low backstairs cunning"- A.L.Guerard; "backstairs intimacies"; "furtive behavior")
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