stealthy
adj. B2 Upper Intermediate US //ˈstɛɫθi// UK //stˈɛlθi// stealthy
adj. quiet and careful so that no one sees or hears you. You use this to describe someone or something moving in a secret way.
adj. behaving or done in a cautious and surreptitious manner, so as not to be seen or heard.
The cat made a stealthy approach toward the bird.
The thief used stealthy movements to avoid waking the residents as he moved through the dark house.
Modern fighter jets utilize stealthy designs and specialized coatings to minimize their radar cross-section, allowing them to penetrate enemy airspace without detection.
Usage
Often used to describe physical movement or the design of military technology.