Most is adjective or adverb, comparative or superlative in the following phrase?

Solution 1:

First, the register is spooky and archaic, so who knows what edition of Fowler's (none, in reality) one should consult. Ye and thee are only used whimsically or to create an atmosphere; thee I believe was restricted to the singular accusative.

Second, though traditionally words modifying adjectives, or other adverbs, were also called adverbs, a more logical modern term is secondary modifier. Very and most are degree modifiers within this class, as is slightly etc; worryingly and annoyingly are secondary modifiers with more semantic content than that possessed by degree modifiers.

Most has another existance as a pronoun and yet another as a quantifier; very can be an intensifier before a noun (the very man), and worryingly and annoyingly exist, of course, as adverbs also.