stealthy

This term describes a quality of calculated invisibility, whether achieved through physical silence or advanced technology. It carries a connotation of intent, often implying a predatory or strategic motive where the goal is to avoid detection to gain an advantage.

In modern technical contexts, the word shifts from describing human behavior to describing engineering specifications. It refers to the specific ability of an object to evade radar or sonar, moving the concept from a behavioral trait to a structural property.