blithe

She had a blithe disregard of cultures outside the United States.

Southern liberals (there are a good few) exhibit blithe insouciance: it is a real blight.

But not more blythe than sylvan court, Than we have been at humbler sport; Though small our pomp, and mean our game, Our mirth, dear Marriot, was the same.

Tarry, tarry, ye wha were aye sae blythe to be at the meetings of the saints, and wad ride every muir in Scotland to find a conventicle.