The superlative is most gracefully.
Almost all adverbs that are not also adjectives (e.g. fast, high), and all that end in -LY, form the comparative and superlative using the words "more" and "most."
No. Graceful is an adjective. The adverb form is gracefully.
Yes, gracefully is an adverb, from the adjective graceful.
Yes, it can be. Worst can be a superlative adjective or a superlative adverb (meaning most badly).
Smoothest is the superlative form of the word smooth. The comparative form is smoother.
No, it is an adjective. The adverb form is beneficially.
most gracefully
Gracefully, more gracefully, most gracefully.
No. Graceful is an adjective. The adverb form is gracefully.
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.
more gracefully, most gracefully
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
Yes, gracefully is an adverb, from the adjective graceful.
memorable
Busiest is not an adverb. It's the superlative form of the adjective busy.