Stealth is moving so quietly that nobody notices. By stealth, stealth tactics, a stealth aircraft.
By stealth is the phrase that carries a judgement — a stealth tax is one imposed without being announced as one. A stealth aircraft is shaped and coated to scatter radar rather than to be invisible. The word comes from the same root as steal.
1nounstealthMoving so quietly that nobody notices.
“The cat crept towards the bird with great stealth.”
stealth is a secrecy.
Middle English stelthe comes from stelan, to steal. The word first meant the act of stealing.
Proto-Germanic
*stēliþō
Old English
stǣlþ
Middle English
stelthe
English, today
stealth
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. Compare Old English stalu (“theft, stealth”), Old High German stāla (“theft”), German Diebstahl (“theft”).
Etymology from Wiktionary, CC BY-SA