bloviate

verb

1. (US, intransitive)To speak or discourse at length in a pompous or boastful manner.

   “Peter P. Low, Esq., will with open throat…bloviate about the farmers being taxed upon the full value of their farms, while bankers are released from taxation.”

   “His passion when bloviating was furious and terrible to look upon; but there was nothing to it more than sound and pretense.”

   ““The cost of appearing with this bloviating ignoramus is obvious, it seems to me,” he said on “This Week,” the ABC News program.”

   “And in turn, more complex ones: could his son have become Boris Johnson, bloviating commentator and one-time prime minister of Britain, without one [a nanny]?”