IPA: /ˈstɛlθi.nəs/
KK: /ˈstɛlθiˌnəs/
The quality of being able to move or act without being noticed or detected.
The cat's stealthiness allowed it to sneak up on the unsuspecting bird.
Stealthiness → It is formed from "stealth" (from Old English *stielþ*, meaning secret or hidden) and the suffix "-iness" (meaning the quality of). The word "stealthiness" refers to the quality of being secretive or hidden.
Think of the Old English word for secret or hidden, which helps you remember that stealthiness means the quality of being secretive.