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How to sign: 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";
Similiar / Same: furtive, sneak, stealthy, surreptitious, lurking, sneaky