stealth
n. C / Un. the quality of being quiet and hidden so that no one notices you. You use this word when someone moves or acts without being seen or heard.
n. the quality of being silent, hidden, or unnoticed; the state of operating without detection. Uncountable in its abstract sense; countable when referring to specific modes of operation or technology.
The cat moved with stealth across the floor.
The soldiers used stealth to avoid detection by the enemy patrols.
Modern military aircraft rely on stealth technology to remain invisible to radar systems, fundamentally changing the dynamics of aerial combat.
From Middle English stelthe, from Old English stǣlþ, from Proto-Germanic stēliþō, to Proto-Germanic stelaną (“to steal, to sneak”) + *-iþō, equivalent to steal + -th (abstract nominal suffix). Compare Old English stalu (“theft, stealth”), Old High German stāla (“theft”), German Diebstahl (“theft”).