1611. Cotgr., Insurmontable,… vnsurpassable, vnvanquishable.
1799. W. Taylor, in Robberds, Mem. (1843), I. 243. The descriptive parts of this idyll are capital—are unsurpassable.
1837. Carlyle, Fr. Rev., I. III. iii. For freshness of style,… that opening Harangue of his was unsurpassable.
1876. Contemp. Rev., June, 36. A sea-board … capable of producing … fruits, in quantities unsurpassable.
Hence Unsurpassably adv.
1859. Ruskin, Two Paths, App. I. 254. Entirely, admirably unsurpassably right, under the conditions.
1871. Carlyle’s Schiller, Wks. 1899, XXV. 226. Dannecker … has unsurpassably cut this head in marble for us.
