stealthy

adj., -i·er, -i·est.
Marked by or acting with quiet, caution, and secrecy intended to avoid notice. See synonyms at secret.

stealthily stealth'i·ly adv.
stealthiness stealth'i·ness n.

adjective

So slow, deliberate, and secret as to escape observation: catlike, feline, furtive, slinky, sneaking, sneaky. See move/halt.

adj

Definition: quiet and secretive
Antonyms: open, public

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IN BRIEF: Being sly or secret in action.

She crept forward in a stealthy manner.

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The adjective has one meaning:

Meaning #1: marked by quiet and caution and secrecy; taking pains to avoid being observed
  Synonyms: furtive, lurking, skulking, sneak, sneaky, surreptitious

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