Lacking or showing a lack of due concern; casual: spoke with blithe ignorance of the true situation. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "blithe" in a sentence
"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."