The superlative of far is farthest or furthest. Some people hold there is no difference between them, others prefer farthest for physical distance and furthest for metaphysical uses.
No. Superlative is an adjective. The adverb form is superlatively (in a comparative manner).
No. Safest is the superlative form of the adjective safe (most safe).The adverb form of safe is safely, and the superlative form of the adverb is most safely.
No, it is an adjective (superlative of kind).The adverb form would be most kindly (superlative of kindly).
easily is an adverb and does not have a superlative. easy is an adjective and has the superlative form easiest. eg That was the easiest game we have had.
Soonest
Busiest is not an adverb. It's the superlative form of the adjective busy.
Quickly is an adverb The comparative form of quick is more quicker. The superlative form of quick is quickest.
Yes. it is the superlative form of the adjective bad. It can also be the superlative form of the adverb badly (most badly).
Yes, it is an adverb. It is the superlative form of "distinctly." (Put another way, it is the adverb form of the adjective "most distinct.")
No, the word fluffiest is not an adverb. The word is an adjective.The adverb form would be fluffily.
tunefully is the adverb, most tunefully the superlative. She sang most tunefully
The answer is sooneest