most superior in quality (of a group)

most excellent

the one, single, example; and no other; and nothing else or more; but it must me added that; (used to introduce a condition or reason)

singular

first in order of importance

most important

one only; not married; for the use of; used for, done by, one person

alone, distinct

excellent; first class

excellent, first-rate

of the highest degree or quality; a form of an adjective or adverb expressing the highest degree (usually made by adding '-est' or with 'most'), such as 'happiest', 'longest', 'worst', 'most likely'

excellent, first-class

having no equal

superlative

never done or known before

exceptional, original