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nonchalant

[non-shuh-lahnt, non-shuh-lahnt, -luh nt] /ˌnɒn ʃəˈlɑnt, ˈnɒn ʃəˌlɑnt, -lənt/
adjective
1.
coolly unconcerned, indifferent, or unexcited; casual:
His nonchalant manner infuriated me.
Origin of nonchalant
1725-1735
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
Related forms
nonchalantly, adverb
Synonyms
cool, calm, collected, composed.
Antonyms
excitable.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for nonchalantly

nonchalant

/ˈnɒnʃələnt/
adjective
1.
casually unconcerned or indifferent; uninvolved
Derived Forms
nonchalance, noun
nonchalantly, adverb
Word Origin
C18: from French, from nonchaloir to lack warmth, from non- + chaloir, from Latin calēre to be warm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for nonchalantly

nonchalant

adj.

1734, from French nonchalant, present participle of nonchaloir "be indifferent to, have no concern for" (13c.), from non- "not" (see non-) + chaloir "have concern for," ultimately from Latin calere "be hot" (see calorie). French chaland "customer, client" is of the same origin. Related: Nonchalantly.

Online Etymology Dictionary, © 2010 Douglas Harper
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