superlative
su-per-la-tive
noun
The form of an adjective or adverb expressing the highest degree.
"'Best' is the superlative of 'good'."
adjective
Of the highest quality or degree; extremely good or excellent.
"Her performance was truly superlative."
Thesaurus
Synonyms: tiptop, top, meridian, peak, elevation, acme, pinnacle, height, summit, superlative degree, sterling, superior