Definition of "insouciantly"

A majority of the camera and sound and makeup crew are female, but a lot of these, too, have a similar look: 30ish, makeupless, insouciantly pretty, wearing faded jeans and old running shoes and black T-shirts, and with lush well-conditioned hair tied carelessly out of the way so that strands tend to escape and trail and have to be chuffed out of the eyes periodically or brushed away with the back of a ringless hand […]

1997, David Foster Wallace, “David Lynch keeps his head”, in A Supposedly Fun Thing I'll Never Do Again, Kindle edition, Little, Brown Book Group