most brilliant
Consider the adjective "bright." The comparative form is brighter, the superlative form is brightest.
Adjectives can be classified by degree. If the positive form is bright, the comparative form is brighter and the superlative form is brightest.
The usual adverb form is brightly. Rarely, bright itself is used as an adverb (The fire burning bright).Reflecting this, the comparative and superlative forms are sometimes the same as the adjective: brighter (more brightly) or brightest (most brightly).
bright, brighter, brightest
The comparative form of busy is busier.
The comparative form of dreamy is dreamier
The comparative form of friendly is friendlier.
comparative form is cleaner superlative form is cleanest
The comparative form of "central" is "more central."
The comparative form of many is more
The comparative form of "clean" is "cleaner."