What is the comparative form of peacefully?

There isn't a comparative form of "peacefully" in the traditional sense. "Peacefully" is an adverb, describing how something is done. Adverbs typically don't have comparative forms like adjectives (e.g., bigger, smaller).

To express a greater degree of peacefulness, you'd use phrases like:

* More peacefully

* In a more peaceful manner

* More calmly

* More serenely

For example:

* "The bird sang peacefully."

* "The bird sang more peacefully than before."