A lengthy discourse in a pompous or boastful manner(noun)
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Use "bloviation" in a sentence
"They are lucky to live in America where such bilious bloviation is allowed."
"Well, I’m used to hearing that kind of bloviation at graduation exercises."
"There's already been a boatload of bloviation expressed on the recent reversal of the ban on loaded firearms in our national parks, some of it sensible but most of it (predictably) bordering on hysterics."