in·sou·ci·ance
inˈso͞osēəns,inˈso͞oSHəns/

noun

1. casual lack of concern; indifference.
   “synonyms: nonchalance, unconcern, indifference, heedlessness, calm, equanimity, composure, ease, airiness; informal cool

– Dictionary

(Note: I should not be having so much fun with this!)

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