incomparable

Being such that comparison is impossible; incommensurable.

So outstanding as to be beyond comparison; unsurpassed.

Not comparable; admitting of no comparison; especially, without a match, rival, or peer; unequaled; transcendent.

Synonyms Matchless, peerless, unrivaled, unparalleled, nonpareil.

In ornithology, the painted finch, Cyanospiza or Passerina ciris, more commonly called nonpareil.