[non-shuh-lahns, non-shuh-lahns, -luhns]
the state or quality of being nonchalant; cool indifference or lack of concern; casualness.

1670–80; < French; see nonchalant, -ance Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nonchalant (ˈnɒnʃələnt)
casually unconcerned or indifferent; uninvolved
[C18: from French, from nonchaloir to lack warmth, from non- + chaloir, from Latin calēre to be warm]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1670s, from Fr. nonchalant, prp. of nonchaloir "be indifferent to, have no concern for" (13c.), from non- "not" + chaloir "have concern for," ultimately from L. calere "be hot" (see calorie). French chaland "customer, client" is of the same origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It chose not to, adding a worry that anti-Semitism displays are being met with
  inexcusable nonchalance.
My nervous attempt at nonchalance was obviously insufficient.
The validity of entire chapters in history are denied with chilling nonchalance.
What is even more astounding is the nonchalance of the clients.
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