The adverb in the sentence is "very," as it modifies the adverb "quietly."
"Arabel was sitting very quietly."
Very very quietly.
Quietly...very quietly
The word "buzz" is an example of onomatopoeia because it imitates the sound of a bee flying.
very quietly
We sat very quietly in the tornado shelter until the danger had passed.
In music most terms come from Italian. p is an abbreviation of "piano" meaning "softly" or "quietly" (playing softly would be playing quietly). pp is an abbreviation for "pianissimo" meaning "very softly" or "very quietly".
very quietly.
Very quietly - in a pew.
Very quietly.
Often very swiftly, and very quietly.