Definition of "inimitable"

Moreover, a perfect Medal has its Profile and out-ſtroaks ſharp (Nummus aſper) and by no means rugged; the Figures clean and well poliſh'd; the Contours neatly trimm'd, and exactly round and carefully preſerv'd; that the Extancy and Relievos correſpond with the Ingraving, and have not ſuffer'd in Percuſſion; in all which, there is a certain Spirit of Antiquity and Excellency to be diſcern'd in Antient Medals almoſt inimitable.

1697, J[ohn] Evelyn, “Instructions How to Collect, and Procure such Medals as are Antique, and Rare; and to Distinguish the True from the False, for the Prevention of Frauds and Impostures”, in Numismata. A Discourse of Medals, Antient and Modern. […], London: […] Benj[amin] Tooke […], page 201

Sterling himself, though he had the most picturesque and inimitable vocabulary of vituperation, was highly squeamish about ordinary smut or profanity. He had indeed that nice-Nelliness which is often characteristic of the Don Juan type.

1947, Miriam Allen deFord, “Laureate of Bohemia: George Sterlin”, in They Were San Franciscans, Caldwell, Idaho: The Caxton Printers, Ltd., page 306