Etymology From Middle English selly, selly, sellich, from Old English sellīċ, seldlīċ (“rare, strange, wondrous”), from Proto-West Germanic *seldalīk, from Proto-Germanic *seldalīkaz, equivalent to seld + -ly. Cognate with Scots selly, silly (“approved, good, worthy”), Old Saxon seldlīk (“rare, wonderful”), Gothic 𐍃𐌹𐌻𐌳𐌰𐌻𐌴𐌹𐌺𐍃 (sildaleiks, “wonderful”).
Etymology From Middle English selly, selly, sellich, from Old English sellīċ, seldlīċ (“rare, strange, wondrous”), from Proto-West Germanic *seldalīk, from Proto-Germanic *seldalīkaz, equivalent to seld + -ly. Cognate with Scots selly, silly (“approved, good, worthy”), Old Saxon seldlīk (“rare, wonderful”), Gothic 𐍃𐌹𐌻𐌳𐌰𐌻𐌴𐌹𐌺𐍃 (sildaleiks, “wonderful”).
His brother was […] selly sick and sore unsound.1470–1485 (date produced), Thomas Malory, “(please specify the chapter)”, in [Le Morte Darthur], (please specify the book number), [London: […] by William Caxton], published 31 July 1485, →OCLC; republished as H[einrich] Oskar Sommer, editor, Le Morte Darthur […], London: David Nutt, […], 1889, →OCLC:
selly
noun
Etymology From Middle English selly, selly, sellich, from Old English sellīċ, seldlīċ (“rare, strange, wondrous”), from Proto-West Germanic *seldalīk, from Proto-Germanic *seldalīkaz, equivalent to seld + -ly. Cognate with Scots selly, silly (“approved, good, worthy”), Old Saxon seldlīk (“rare, wonderful”), Gothic 𐍃𐌹𐌻𐌳𐌰𐌻𐌴𐌹𐌺𐍃 (sildaleiks, “wonderful”).
The line is a masterstroke of noncommitment, for the event is a "selly" in the sight of some unidentified readers.1995, Robert J. Blanch, Julian N. Wasserman, From Pearl to Gawain: