stealth
[noun]
Synonyms: secrecy, furtiveness, slyness, sneakiness, stealthiness, surreptitiousness, unobtrusiveness

[TahlilGaran] English Synonym Dictionary ▲

stealth /stelθ/ noun [uncountable]
[Date: 1200-1300; Origin: From an unrecorded Old English stælth 'stealing']

1. when you do something very quietly, slowly, or secretly, so that no one notices you:
Cats rely on stealth to catch their prey.

2. (also Stealth) a system of making military aircraft that cannot be discovered by radar instruments
stealth bomber/aircraft/fighter etc (=a plane made using this system)

[TahlilGaran] Dictionary of Contemporary English ▲