STEALTH

[noun] [U] - movement which is quiet and careful in order not to be seen or heard, or secret or indirect actionThese thieves operate with terrifying stealth - they can easily steal from the pockets of unsuspecting travellers.It would seem that some politicians would prefer to use financial stealth rather than legislation to produce change.The weapons had been acquired by stealth.The Stealth bomber/fighter is an aircraft which cannot be seen on radar.