This insouciant sense of color sets the prep apart from the mere traditionalist.
From the sfgate.com
Everett, in turn, demonstrates that Wilde's insouciant manner was partly a mask.
From the independent.co.uk
His insouciant handling of the oil spill in the Gulf is under fire from all sides.
From the economist.com
Americans are once again enjoying the familiar insouciant pleasures of the season.
From the time.com
Bacon is coolly insouciant as a swinging musician in this small but key part.
From the usatoday.com
Also, I think that you're a bit too insouciant regarding Issa's motives here.
From the economist.com
This is insouciant insolence by the Teamsters, who are situational ethicists.
From the ocregister.com
The insouciant poise that helped her become world champion had deserted her.
From the thenewstribune.com
There were several variations on the bustle, insouciant and not very subtle.
From the time.com
More examples
Casual: 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"
(insouciance) carefreeness: the cheerful feeling you have when nothing is troubling you