From Middle English selcouth, from Old English selcūþ, seldcūþ (“unusual, unwonted, little known, unfamiliar, novel, rare”), from seld- (“rarely”) + cūþ (“known”); equivalent to seld + couth.
selcouth (comparative more selcouth, superlative most selcouth)
- (now rare) Strange, unusual, rare; unfamiliar; marvellous, wondrous.
1814, Walter Scott, Ivanhoe, Reprint edition, Penguin, published 2000, →ISBN, page 244:
'A selcouth novelty,' muttered the knight, 'to advance to storm such a castle without pennon or banner displayed.'
2002, Edward Cline, Sparrowhawk II: Hugh Kenrick (Fiction), Digitized edition, MacAdam/Cage Pub., published 2011, →ISBN, page 318:
The statements in either document are unique and selcouth.
2007, Mark Youngblood Herring, “Caught in the Web”, in Fool's Gold: Why the Internet is no Substitute for a Library, McFarland, →ISBN, page 37:
Left to its own devices and without the Web as a vehicle for misinforming others, the selcouth dogmas that forbade sexual relations ...
strange, rare, marvellous