blithe

Casually careless or indifferent; showing a lack of concern; nonchalant.

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.

Cheerful, happy.

And now ſweet Emperour be blithe againe, And bury all thy feare in my deuiſes.

There on Beds of Violets blew, And freſh-blown Roſes waſht in dew, Fill'd her with thee a daughter fair, So buckſom, blith, and debonair.

A river in Staffordshire, England, which joins the River Trent.