menacingly
No, "powerful" is not an adverb. It is an adjective used to describe the noun it modifies.
most powerful
very is an adverb (technically an adverb clause = adverb+adjective) in this sentence, excited is an adjective that's being modified by the word very.
The adverb in the sentence is "very," as it modifies the adverb "quietly."
The word very is an adverb.
You could say Quickly the boy ran all throughout the small village. Or, Slowly the sloth crawled onto the next branch.
One adverb of "cheap" is "very,", ie. such as very cheap.
The past tense is crawled.
Both words can be adverbs, and very is definitely an adverb modifying well. Depending on the sentence, well might be an adjective or an adverb. He draws very well. (well is an adverb) He is very well. (well is an adjective)
stentorian...having a loud or powerful voice
The adverb carefully modifies the verb drives.The adverb very modifies the adverb carefully.
Very is the adverb in that sentence.