[non-shuh-lahnt, non-shuh-lahnt, -luhnt]
coolly unconcerned, indifferent, or unexcited; casual: His nonchalant manner infuriated me.

1725–35; < French nonchalant, present participle of obsolete nonchaloir to lack warmth (of heart), be indifferent, equivalent to non- non- + chaloir < Latin calēre to be warm. See -ant

nonchalantly, adverb

cool, calm, collected, composed.

excitable. 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
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Word Origin & History

1734, from Fr. nonchalant (see nonchalance). Related: Nonchalantly.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Hansen tried to speak nonchalantly but the words came out in a hoarse croak.
He saw a bull elk nonchalantly grazing about ten feet from the flames.
On Thursday, he told his story so nonchalantly that he could have been telling
  a friend about a horror movie he had just seen.
He seems nonchalantly, confidently happy.
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