most active
The superlative degree of stout is stoutest.
Cleanest is the superlative degree of the word clean. Cleaner is the comparative degree
"Fool" is a verb and a noun and, as such, does not have a superlative degree. The superlative degree of the adjective foolish is most foolish.
The superlative degree of word sincere can be most sincere ,or sincerest according to its use in the sentence.
most in
"Grant" is a verb and a noun and, as such, does not have a superlative degree.
The comparative degree is 'more magnificent' and the superlative degree is 'most magnificent'.
The form "most active" is the superlative form of the adjective "active."The comparative is more active.For the adjectives less and slower, the superlatives are least and slowest. The superlative adjective form of the adverb more rapidly would be most rapid.
The superlative degree of word sincere can be most sincere ,or sincerest according to its use in the sentence.
Best.
finer, finest
greedier, greediest