• WordNet 3.6
    • adj insouciant marked by blithe unconcern "an ability to interest casual students","showed a casual disregard for cold weather","an utterly insouciant financial policy","an elegantly insouciant manner","drove his car with nonchalant abandon","was polite in a teasing nonchalant manner"
    • ***
Webster's Revised Unabridged Dictionary
    • a Insouciant Careless; heedless; indifferent; unconcerned.
    • ***
Century Dictionary and Cyclopedia
    • insouciant Destitute of care or forethought; heedless of consequences or of the future; indifferent; unconcerned.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Insouciant in-sōō′si-ant indifferent: careless
    • ***


Webster's Revised Unabridged Dictionary
Chambers's Twentieth Century Dictionary
Fr. in, not, souciantsouci, care.


In literature:

How I envied Peter his easy, insouciant manner!
"The Golden Road" by Lucy Maud Montgomery
Your innocence and childish insouciance is going to lead me back into an honest life.
"Whirligigs" by O. Henry
Her usual insouciance was gone, and her hands nervously fingered the opal beads of her long necklace.
"Dangerous Days" by Mary Roberts Rinehart
Bannister looked at his debonair insouciance and laughed.
"Wyoming, a Story of the Outdoor West" by William MacLeod Raine
He thought of his past, its cold splendour and insouciance.
"Zuleika Dobson" by Max Beerbohm
Marion was discussing dog-breeding with that cool, crude, direct insouciance so unpleasant to some men.
"The Fighting Chance" by Robert W. Chambers
Amparito had an extraordinary insouciance, gaiety, facility, in accepting life.
"Cæsar or Nothing" by Pío Baroja Baroja
Yet from her came these sufficient, insouciant replies.
"Miss Lulu Bett" by Zona Gale
How abruptly had his insouciance changed to devotion, his impertinence to respect!
"The Castle Inn" by Stanley John Weyman
But Mr. Wrissell held out a hand with the perfection of urbane insouciance.
"The Regent" by E. Arnold Bennett

In poetry:

Van Dyke beard and broidered ruff silently confess
That he lived--and loved perchance--in days of Good Queen Bess.
(Laces fine and linen sheer, curled and perfumed hair
Well became those gentlemen of gay, insouciant air.)
"At The Play" by Virna Sheard

In news:

Francis Veber's The Closet dances around the subject of misperceived gayness in the workplace with boulevard insouciance that presupposes most of the nervous laughs coming from a predominantly straight audience.
As a real-life critic, I can only applaud the movie's insouciant mockery of the world that spawned it.
It's hard to envision a more insouciant widow.
Gloriously elaborate and hermetic, Jim Lutes' invariably small paintings — currently rendered in that most ancient of painting media, egg tempera — are also radiantly, insouciantly gnarly in their cartoonishly but viscerally strange imagery.
Many who saw Madoff on video that day perceived him to be insouciant, or even smirking .
There is no Hollywood movie more insouciantly amoral than Ernst Lubitsch's 1932 Trouble in Paradise.
The Insouciance of a Modern Monarchy .
Men of rugged, insouciant, determined countenance.
There was something inspiring in New Jersey governor Jon Corzine's insouciance last week: rising from his deathbed, paying a photo-op $46 fine for violating the seat-belt law, and then speeding off toward home at 70 miles per hour.