calmly; quietly; gently; peacefully
Adverbial form of 静か, used to describe doing something in a calm, quiet, or gentle manner.
He quietly closed the door.
Used as an imperative expression to tell someone to be quiet or calm down.
The baby is sleeping peacefully.
Be quiet! I'm talking about something important right now.
Adverbial form of the na-adjective 静か (shizuka), which is of native Japanese origin. The exact derivation of 静か is uncertain.