IPA: /ˈfɜːtɪvli/
KK: /ˈfɜrtɪvli/
In a way that is secretive or sneaky, often because one is trying to avoid being noticed or caught.
She glanced furtively around the room to see if anyone was watching her.
Furtively → It is formed from "furtivus" (from Latin, meaning secret or stealthy) and the adverbial suffix "-ly" (meaning in a manner of). The word "furtively" means in a secretive or stealthy manner, as if trying to avoid notice.
Think of doing something in a 'secret' way ('furtivus') — that's why 'furtively' means acting in a stealthy manner.