The comparative degree of cheerful is more cheerful.Its superlative degree, then, is most cheerful.
The superlative degree of selfish is "most selfish", and the comparative degree is "more selfish".
The comparative degree is 'more magnificent' and the superlative degree is 'most magnificent'.
comparative degree: more truthful superlative degree: most truthful
most, more
most
more in, most in
The comparative degree of sincere is more sincere.
The comparative degree of excellent is more excellent, and the superlative degree of excellent is most excellent.
More is comparative. The progression is many, more, most
Comparative = more important Superlative = most important
comparative-more promptly, superlative-most promptly