Indifferent, careless, showing a lack of concern. (adjective)
Examples of word blithe
There was an unopened bottle of Woiwora, that my sister had sent me – in blithe disregard of postal regulations – as a housewarming present, under the impression that decent Polish vodka would be unavailable in the wild West.
Affected an expression of blithe dignity for the benefit of any of Williams neighbors who might be wondering at the strange woman on his doorstep who seemed content to knock all night.
In 2000, he was in blithe denial about global warming, although by 2001, he was ready to admit that there might be something to it after all.
Here is the hardest question: How could the Administration have thought that it was safe to proceed in blithe indifference to the warnings of nearly everyone with operational experience in modern military occupations?
A less daring adventurer than Molly would have hesitated at his tone and grown cautious, but a certain blithe indifference to the consequences of her actions was a part of her lawless inheritance from the Gays.