Adjective furtive has 2 senses
  1. furtive, lurking, skulking, sneak, sneaky, stealthy, surreptitious - 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"
    Antonym: unconcealed (indirect, via concealed)
  2. backstair, backstairs, furtive - secret and sly or sordid; "backstairs gossip"; "his low backstairs cunning"- A.L.Guerard; "backstairs intimacies"; "furtive behavior"
    Antonyms: overt, open (indirect, via covert)
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