And then there are the funny ones such as ning nong, doofus, blatherskite. Etymology – the origins of words « Write Anything

The Tyler Telegram humbly apologizes for having called that wide-lipped blatherskite, T. DeWitt Talmadge, "a religious faker." The Iconoclast

The Tyler Telegram humbly apologizes for having called that wide-lipped blatherskite, T. DeWitt Talmadge, "a religious faker." Archive 2007-05-01

Perot, whose preferred rhetorical mode is the murky expostulation, is what used to be called a blatherskite. The Veep And The Blatherskite

I think the word you are looking for is blatherskite. Think Progress » Highlights From Tony Snow’s First Press Gaggle

In contrast, you are a blatherskite living on other human beings and giving them nothing as empty words in return, i.e. the lifestyle of a social parasite. Social progress is our Duty

Finally, several years later, to complete the circle of poisoned feelings, Mark Twain broke with Edward House: “Reid had labeled him correctly; he was a blatherskite.” Mark Twain

Finally, several years later, to complete the circle of poisoned feelings, Mark Twain broke with Edward House: “Reid had labeled him correctly; he was a blatherskite.” Mark Twain

"It's a thundering lie, you miserable old blatherskite!" Pudd'nhead Wilson