Capable of or characterized by a high or excellent level of performance or efficiency.
Characterized by a level of performance or efficiency that is adequate for or exceeds the expectations of end users.
Of or relating to performance.
Exceptionally good; of the highest quality; superb.
Of or relating to a superlative.
The extreme (e.g. highest, lowest, deepest, farthest, etc) extent or degree of something.
An adjective used to praise something exceptional.
The form of an adjective that expresses which of several items has the highest degree of the quality expressed by the adjective; in English, formed by appending "-est" to the end of the adjective (for some short adjectives only) or putting "most" before it.