This is the 952nd most frequent Italian word.
rapidamente
Quickly.
This sentence demonstrates the adverb 'rapidamente' describing the manner in which the action of completing the work occurred.
Marco ha completato il suo lavoro rapidamente.
Marco quickly completed his work.
In this example, 'rapidamente' is used to describe how promptly the response to the question was given.
Lei ha risposto rapidamente alla domanda del professore.
She quickly responded to the professor's question.
The word 'rapidamente' here modifies the verb 'accelerava,' indicating the speed of the car's acceleration.