IPA: /ˈsniːkɪŋli/
KK: /ˈsniːkɪŋli/
In a way that is secretive or stealthy, often to avoid being noticed or caught.
He sneakingly entered the room to surprise his friend.
**Sneakingly** → It is formed from "sneak" (of uncertain origin, possibly from Middle Dutch *snecken*, meaning to creep or move stealthily) and "-ingly" (a suffix used to form adverbs indicating manner). The word "sneakingly" means in a manner that is stealthy or secretive, as if moving quietly or furtively.
Think of moving in a 'stealthy' way, as suggested by 'sneak', and remember that 'sneakingly' describes doing something in a secretive manner.