Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Seeming to be coolly unconcerned or indifferent. See Synonyms at cool.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Casually calm and relaxed.
  • adj. Indifferent; unconcerned; behaving as if detached.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Indifferent; careless; cool.

from The Century Dictionary and Cyclopedia

  • Indifferent; unconcerned; careless; cool: as, he replied with a nonchalant air.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. marked by blithe unconcern

Etymologies

French, from Old French, present participle of nonchaloir, to be unconcerned : non-, non- + chaloir, to cause concern to (from Latin calēre, to be warm, heat up).
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French nonchalant, from Old French nonchaloir ("to not be concerned"), from non- ("not") + chaloir ("to have concern for"), from Latin non 'not' + calere 'to be warm' (Wiktionary)

Examples

  • At that moment, she gave a new meaning to the word nonchalant when she casually adjusted her right foot to let her arm rest on her knee and placed the other foot on the floor.

    The Brotherhood of Man

  • That's what I call a nonchalant dismissive attitude that we can all aspire to.

    BSNYC Product Review: Look 566 Road Bicycle

  • “Yes,” I said, trying to keep my expression nonchalant, “but at least you’ll have a reputation.”

    The Little Lady Agency and the Prince

  • His expression was nonchalant as he made a dismissive gesture.

    Thieves Like Us

  • We cowered in a faint indentation in the wall, pressing against the dripping bushes, and I heard the vehicle scrape a quantity of paint from its opposite side before it was past, the driver calling a nonchalant thanks.

    The Moor

  • The result is that the game's violence, relegated to the distance, feels nonchalant, which is a damn shame considering Argonauts 'use of the Unreal engine makes for some pretty tasty gibs.

    Daily Vanguard RSS

  • To keep the acronym in tact, perhaps our journalist is "nonchalant", or seeming to be coolly unconcerned or indifferent?

    BSNYC Friday Fun Quiz!

  • Other people I talked to have just been kind of nonchalant about it, as it were.

    CNN Transcript Jul 23, 2008

  • Really kind of nonchalant and really almost just enjoying themselves, not even thinking about what's literally right out the window.

    CNN Transcript Sep 1, 2008

  • ANDERSON: Just kind of nonchalant about the whole thing.

    CNN Transcript Jul 27, 2007

Comments

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  • My grandmother, a school teacher, told me, when I was a small boy that the definination of nonchalant was a little boy who peed in his pants and didn't care which leg it ran down.

    February 18, 2010

  • *follows Pro and Chained with lithe unconcern*

    June 3, 2009

  • ... that was an accident. I didn't know I was madeupicalizing anything. Actually I wasn't, because it's in the WeirdNet definition.

    Shoot... *goes back and brackets madeupicalizing, just in case*

    June 3, 2009

  • Would you bracket unconcern, please?

    June 3, 2009

  • My concern cannot be blithe. Only my unconcern. Otherwise they get in a fistfight, which is something, considering neither of them have anything resembling fists.

    Now, lithe concern, that's another matter.

    June 3, 2009

  • It could depend on your viewpoint. Maybe you enjoy concern. Then it might be blithe.

    *blithely concerned that this conversation is going nowhere*

    June 3, 2009

  • Only oxymoronically, I suspect.

    June 3, 2009

  • I don't rightly know. Can concern be blithe?

    June 3, 2009

  • Is it blithe? The concern, I mean.

    June 3, 2009

  • I try not to. It's too stressful to be marked by concern.

    May 26, 2009

  • Can one also be chalant?

    May 25, 2009

  • Tolle Wörter sind hier zu finden. Stosse immer wieder auf deine Liste, wenn ich bei mir (http://wordie.org/people/gebsn) neue Wörter eintrage.

    September 8, 2007