rapidly
adv. manneradv. very fast or in a short amount of time. You use this to describe how something changes or moves quickly.
adv. at a great speed; very quickly. Often used to describe the rate of change, growth, or movement in a formal or objective context.
The city is growing rapidly.
Technology is changing so rapidly that it is hard for many people to keep up with new devices.
The company's stock price rose rapidly following the announcement of a breakthrough in renewable energy storage, catching many market analysts by surprise.
From rapid + -ly.
Typically placed after the verb it modifies or at the end of the clause.
The rapidly growth of the cityThe rapid growth of the cityLearners often use the adverb 'rapidly' to modify a noun instead of the adjective 'rapid'.