stealthy

/ˈstel-thē/

adjective

  1. slow, deliberate, and secret in action or character

  2. intended to escape observation : furtive

  3. designed to produce a very weak radar return

secret covert stealthy furtive clandestine surreptitious underhanded mean done without attracting observation. secret implies concealment on any grounds for any motive. covert stresses the fact of not being open or declared.