surreptitious

marked by quiet and caution and secrecy; taking pains to avoid being observed

  • And then he remembers his surreptitious identity for the evening: "I'm a freshman at Amherst."1
  • Beholden to paying clients, they were widely seen as surreptitious figures who burglarized people's secrets.2
  • Boys you secretly tutor and meet for surreptitious swimming lessons.3

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