I. ˈstelth noun
Etymology: Middle English stelthe; akin to Old English stelan to steal
Date: 13th century
1.
a. archaic : theft
b. obsolete : something stolen
2. : the act or action of proceeding furtively, secretly, or imperceptibly
the state moves by stealth to gather information — Nat Hentoff
3. : the state of being furtive or unobtrusive
4. : an aircraft-design characteristic consisting of oblique angular construction and avoidance of vertical surfaces that is intended to produce a very weak radar return
II. adjective
Date: 1987
: intended not to attract attention : stealthy
a stealth campaign