"More important" is the comparative degree of important.
more
most, more
"Merrily" is the positive degree of the adverb "merrily."Specifically, the degrees of an adverb range from the basic, positive degree to the second, comparative degree to the third, highest, superlative degree. So the comparative degree in this case is "more merrily." The superlative degree is "most merrily."
comparative=more superlative=much
more rapid
Comparative = more important Superlative = most important
The comparative degree of "deliberate" is "more deliberate."
The comparative degree for "moody" is "more moody."
The comparative degree of "sad" is "sadder."
The comparative degree of the word "honest" is "more honest."
The comparative degree form of "pitiful" is "more pitiful."
The comparative degree of cheerful is more cheerful.Its superlative degree, then, is most cheerful.
More is comparative. The progression is many, more, most
The comparative degree of the adverb "sadly" is "more sadly."
more sincere (sincerer), the most sincere (sincerest)
The superlative degree of selfish is "most selfish", and the comparative degree is "more selfish".
more