unrimpledadj.
/(ˌ)ʌnˈrɪmpld/, U.S. /ˌənˈrɪmp(ə)ld/ literary and poetic. Now rare.
Without rimples; esp. (of a body of water) smooth, unrippled.
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the world > space > shape > flatness or levelness > smoothness > [adjective] > without wrinkles or folds
unfrizzled1611
unrumpleda1643
explicit1697
unpuckered1775
unrimpled1775
wrinkleless1793
foldless1845
creaseless1852
uncrumpled1854
1775 J. Ash New Dict. Eng. Lang. Unrimpled, not rimpled.
a1819 J. W. Eastburn & R. C. Sands Yamoyden (1820) i. xx. 31 Round us waves unrimpled flow.
a1839 J. Galt Demon of Destiny (1840) iii. 21 The placid waters..Were all unrimpled by the gentle air.
1911 Pacific Monthly Aug. 175/1 The trees crowding and jostling down to the edge, leaning over to mirror themselves in the unrimpled water.
This entry has been updated (OED Third Edition, December 2014; most recently modified version published online December 2021).
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adj.1775