insouciance

What, me worry? I'd much rather be insouciant and untroubled, like South Korea seems to be in the face of test missiles launched by its northern neighbor and former enemy:

"To a great extent, though, the South's insouciance about the North's threat is the product of years of peaceful relations."

Link: Launchings put Japan and South Korea on different paths

Posted July 13, 2006.

See our Word Overheard blog to see interesting uses of strange words.

The noun has one meaning:

Meaning #1: the cheerful feeling you have when nothing is troubling you
  Synonyms: carefreeness, lightheartedness, lightsomeness