in·sou·ci·ance [in-soo-see-uhns; French an-soo-syahns]
I would suggest listening to how this word is pronounced if you haven't heard it before. (click on the little speaker next to the word)
1. the quality of being insouciant; lack of care or concern; indifference.
WORDS RELATED TO INSOUCIANCE
negligence, disdain, carelessness, inattention, apathy, lack, nonchalance, alienation, disinterest, disregard, inertia, insensitivity, callousness, inactivity, drowsiness, casualness, indifference, simplicity, spontaneity, familiarity
See synonyms for insouciance on Thesaurus.com
Origin: From French, dating back to 1790–1800; see origin at insouciant, -ance
EXAMPLE SENTENCES FROM THE WEB FOR INSOUCIANCE
But as faking sincerity is difficult, replicating insouciance is a challenge.
WANTED: LESS TERRIBLE POLITICAL COVERAGE ON TV|MATT LEWIS|NOVEMBER 19, 2014|DAILY BEAST
Leno answered, lending a certain insouciance to his line reading.
JAY AND JIMMY TOGETHER|LLOYD GROVE|JANUARY 27, 2014|DAILY BEAST
But he was also a gifted actor, providing an interesting mélange of surfer dude insouciance with a hint of danger.
ACTOR PAUL WALKER, STAR OF ‘THE FAST AND THE FURIOUS’ FILMS, DIES IN CAR CRASH|MARLOW STERN|DECEMBER 1, 2013|DAILY BEAST
Its insouciance with punctuation may lend the book an aura of difficulty, but in practice this is not the case.
GREAT WEEKEND READS|THE DAILY BEAST|JANUARY 22, 2011|DAILY BEAST