bloviate
verb [intransitive] (North American English, informal, disapproving)to talk or write in a way that shows that you think you know a lot and have something important to say, when in fact you do not know much and have nothing important to say （空泛地）高谈阔论；夸夸其谈 All radio talk show hosts blab and bloviate about national security. 所有电台脱口秀主持人都在喋喋不休地谈论国家安全。