Definition of "coolness"

coolness

/ˈkuːlnəs/

noun
usually uncountable, plural coolnesses
1. (uncountable) The state of being cool, i.e. chilly.
2. (countable) The result or product of being cool, i.e. chilly.
3. (uncountable) The state of being cool, i.e. calm.
  Quotations
  Luckily for England, they have a world-class striker with a golden touch in [Harry] Kane, who was coolness personified to carefully direct in the winner.
  2018 June 18, Phil McNulty, “Tunisia 1 – 2 England”, in BBC Sport‎, archived from the original on 21 April 2019
4. Indifference; lack of passion or interest.
5. (slang, uncountable) The state of being cool, i.e. good or pleasing.
6. (slang, countable) The result or product of being cool, i.e. good or pleasing.