Thinnest is the superlative degree of thin.
thinner, thinnest
the superlative degree of much is most
"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.
most often is the superlative degree for often
"Less" is the comparative degree of little. The superlative degree is least.
thinner, thinnest
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.
Comparative: thinner Superlative: thinnest
most often is the superlative degree for often
"Less" is the comparative degree of little. The superlative degree is least.
thinnest