noun

• (dated, usually countable) Conflict or hostility or an instance of such that stands in contrast to expected friendliness or interest.
  "In the midst of enemies, Irish and English, Court treacheries and coolnesses, Strafford depended solely upon Laud, and no one other support."
• (often slang) Social advantage or enviability, typically due to traits like popularity, confidence, skill, or fashion.
  "When I argue that Beverly Hills, 90210 makes use of 'An Americana Cool,' then I mean to propose that the show makes use of a wide variety of culturally codified coolness(es) that is/are anchored in a mainstream American symbology, in an Americana of patterned American styles, gestures, and codes."