Citations:ur-cool

Adjective: "(slang) extremely cool"

 * 1999, Vikram Seth, An Equal Music, Penguin Books (1999), ISBN 9780140285109, page 221:
 * Helen, who is sitting just in front of her, stops playing, and turns to her. "Petra, I think we should cool it here."
 * 1999, Alex Beam, "Still waiting for that New Year's invite", The Boston Globe, 20 August 1999:
 * Happenin' guys Harvey Allen (liquor) and Richie Balsbaugh (media) haven't summoned me to their ur-cool Mistral shindig; a holdup with the mail?
 * 2003, Ramesh Kumar, Malaysia: Riches from the Golden Land, Springer (2003), ISBN 9783211838785, page 81:
 * The pavements were turned into tree-lined, fountained boulevards; which boulevards are enlivened by jazz bands and lasers, lined by new cafes and bars, ur-cool by any standards;
 * 2014, Melena Ryzik, "This Time, Jim Jarmusch Is Kissing Vampires", The New York Times, 3 April 2014:
 * His film, opening April 11, stars Tom Hiddleston and Tilda Swinton as Adam and Eve, an ur-cool bloodsucking couple whose love spans centuries and continents

Noun: "timeless or primordial coolness'"

 * 2000, Charles Shaar Murray, "Oh, my God! They have killed cool", The Independent, 3 October 2000:
 * True "Cool" - capitalised by the authors to indicate its underlying substance - may shift its surface characteristics (other than the eternal sunglasses-after-dark). But its fundamental nature is constant. It is this ur-cool that Pountain and Robins seek to anatomise, and anatomise it they do.