Here's why:
* Quietly is an adverb, describing how something is done.
* Most is the superlative form of the adjective "much," used to compare three or more things.
So, to express the highest degree of quietness, you would use "most quietly."
Here's why:
* Quietly is an adverb, describing how something is done.
* Most is the superlative form of the adjective "much," used to compare three or more things.
So, to express the highest degree of quietness, you would use "most quietly."