alone(p), unique, unequaled, unequalled, unparalleled(adj)

radically distinctive and without equal

"he is alone in the field of microbiology"; "this theory is altogether alone in its penetration of the problem"; "Bach was unique in his handling of counterpoint"; "craftsmen whose skill is unequaled"; "unparalleled athletic ability"; "a breakdown of law unparalleled in our history"

unequaled(Adjective)

Unmatched, superlative, the best ever done, record setting.

Unequaled(adj)

not equaled; unmatched; unparalleled; unrivaled; exceeding; surpassing; -- in a good or bad sense; as, unequaled excellence; unequaled ingratitude or baseness