Definition of insouciance in US English:

insouciance

noun

  • Casual lack of concern; indifference.

    ‘an impression of boyish insouciance’
    • ‘His insouciance spreads a calm that would have you believe that there is nothing that makes his first post different from any other managerial position.’
    • ‘There was also a degree of insouciance about recycling the compost.’
    • ‘After a wobbly start, balance and confidence come back, though not sufficiently to allow one hand to reach down for the water bottle at speed, never mind that old teenage insouciance of riding with both hands in the trouser pockets.’
    • ‘We began by trying not to be London style snobs, to keep our metropolitan insouciance zipped, but the sheer volume, the boundless gaudy vulgarity of it, overwhelms you, and you just have to howl with derision.’
    • ‘Their addiction to the intoxicating thrill of climbing, coupled with the magnificent insouciance of youth, led them to take on a challenge which had defeated everyone else.’
    • ‘This would seem to explain their insouciance about appearing as actors in a drama series that will, if all goes to plan, transform them into successful musicians.’
    • ‘Its unhappy record of arrogant insouciance and incompetence as a monopoly service provider has given its new rivals a record of leaky credibility against which to run.’
    • ‘We enjoy his insouciance and defiance; he has all the best characteristics in a movie where few have any redeeming value.’
    • ‘As what W. H. Auden called the ‘dishonest decade’ grew grimmer, the New Yorker's editorial policy shifted from insouciance to concern.’
    • ‘He incessantly joshes his son, once slugs him in the face with a vase, cracks terrible jokes, struts around in a tweed jacket, and generally makes a virtue out of insouciance and brio.’
    • ‘Her sultry good looks, airy insouciance and withering scorn would have made me her instant slave.’
    • ‘Perhaps this partly explains the stoicism and insouciance of those Brits interviewed on the streets, all of whom seemed to know that a certain sang-froid was expected of them.’
    • ‘He has that enviably precise balance of familiarity and distance, humor and restraint, insouciance laced with respect.’
    • ‘It is also a remarkably accurate portrait of a family who, in two postwar generations, leap from the daily struggle to keep body and soul together to public school insouciance and confidence.’
    • ‘Wahlberg gives the same performance as in his last five movies and lacks the breezy insouciance the picture needs.’
    • ‘I find his insouciance about the difficulty of figuring out ethics disconcerting, though he's right that Nietzsche collapses into Platonism.’
    • ‘There are, admittedly, some who would contend that he can overdo the cavalier insouciance, but, assuredly, the confidence he oozes is certainly very welcome.’
    • ‘I wish I could agree with this call for mature insouciance, one year on.’
    • ‘Mostly, though, Sanders' cheerful insouciance could not be less calculating.’
    • ‘Releasing a fierce battle cry, I pounded flailing fist after flailing fist onto him, oblivious to his insouciance and lack of flinching.’
    nonchalance, unconcern, lack of concern, indifference, heedlessness, relaxedness, calm, calmness, equanimity, coolness, composure, casualness, ease, easy-going attitude, airiness, carefreeness, frivolousness, carelessness
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Origin

Late 18th century: French, from insouciant, from in- ‘not’ + souciant ‘worrying’ (present participle of soucier).

Pronunciation