most cautious
The comparative form of "cautious" is "more cautious," and the superlative form is "most cautious." When comparing two entities, you use "more cautious," while "most cautious" is used when referring to the highest degree of caution among three or more entities.
most cautious
comparative of safely is more safely and the superlative form is most safely
the superlative degree of much is most
No, the superlative degree is "most tirelessly."
The superlative degree of "old" is "oldest."
The superlative degree of stout is stoutest.
The superlative degree of "broad" is "broadest."
The superlative degree of heavy is "heaviest."
"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.
"Less" is the comparative degree of little. The superlative degree is least.
most often is the superlative degree for often