stealthy

Adjective
  1. Marked by quiet and caution and secrecy;
    Taking pains to avoid being observed (synset 302096119)
    "a furtive manner"; "a sneak attack"; "stealthy footsteps"; "a surreptitious glance at his watch"
    similar to: concealed - hidden on any grounds for any motive
    same as: furtive, sneak, sneaky, surreptitious

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