nonchalant

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

Origin:
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.
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World English Dictionary
nonchalant (ˈnɒnʃələnt)
 
adj
casually unconcerned or indifferent; uninvolved
 
[C18: from French, from nonchaloir to lack warmth, from non- + chaloir, from Latin calēre to be warm]
 
'nonchalance
 
n
 
'nonchalantly
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

nonchalant
1734, from Fr. nonchalant (see nonchalance). Related: Nonchalantly.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Buddy's agreement was magnificently nonchalant.
Most of them were pretty nonchalant and haven't spoken to me about it much.
Pete tries to be nonchalant.
They are nonchalant about their famous customers.
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