blather

Etymology 1

From Middle English bletheren, bloderen, from Old Norse blaðra (“to speak inarticulately, talk nonsense”). Cognate with Scots blether, bladder, bledder (“to blather”), dialectal German bladdern (“to talk nonsense, blather”), Norwegian bladra (“to babble, speak imperfectly”), Icelandic blaðra (“to twaddle”).

verb

1. (intransitive, derogatory) To talk rapidly without making much sense.
   On and on he blathered, taking refuge in the one thing he felt lent him superiority: words. 2001, Richard Flanagan, “The Pot-Bellied Seahorse”, in Gould’s Book of Fish, New York, N.Y.: Grove Atlantic, published 2014, section 5
2. (transitive, derogatory) To say (something foolish or nonsensical); to say (something) in a foolish or overly verbose way.
   Then, just before the wedding, the old man feels he’s honor bound to tell his future son-in-law the secret of his past; so the damned idiot blathers the whole story of his killing the man and breaking jail! 1929, Eugene O’Neill, Dynamo, New York, N.Y.: Liveright, act I, scene i, page 31

noun

1. (derogatory) Nonsensical or foolish talk.
   That is the worst of being in an Irish regiment, nothing can be done widout ever so much blather; 1897, G. A. Henty, chapter 1, in With Moore at Corunna, New York: Scribner, page 16
   Will you cease your blather of mutiny and treason and courts-martial? 1922, Rafael Sabatini, chapter 23, in Captain Blood, New York: Grosset & Dunlap, page 265
   With years of proofreading under my belt, I knew exactly the blather and bluster favoured by professional politicians. 1995, Rohinton Mistry, A Fine Balance, Toronto: McClelland & Stewart, Part 5, p. 280

Etymology 2

noun

1. Obsolete form of bladder.
   1596, Charles Fitzgeoffrey, Sir Francis Drake His Honorable Lifes Commendation, and His Tragicall Deathes Lamentation, Oxford: Joseph Barnes, […] on Vlisses Circe did bestowe A blather, where the windes imboweld were,