different between coolness vs seriousness

English

From Middle English colnes, colnesse, from Old English c?lnes, c?lnes (“coolness; cool air, breeze”); equivalent to cool +? -ness.

coolness (usually uncountable, plural coolnesses)

(uncountable) The state of being cool, i.e. chilly.
(countable) The result or product of being cool, i.e. chilly.
(uncountable) The state of being cool, i.e. calm.
Indifference; lack of passion or interest.
(slang, uncountable) The state of being cool, i.e. good or pleasing.
(slang, countable) The result or product of being cool, i.e. good or pleasing. (Can we add an example for this sense?)

serious +? -ness

seriousness (countable and uncountable, plural seriousnesses)

The state or quality of being serious.
- July 18 2012, Scott Tobias, AV Club The Dark Knight Rises[2]
  Though Bane’s sing-song voice gives his pronouncements a funny lilt, he doesn’t have any of the Joker’s deranged wit, and Nolan isn’t interested in undercutting his seriousness for the sake of a breezier entertainment.

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