blath·er 
(blă-=…|th=-ər) also bleth·er (blĕ-=…|th=--)
(blă-=…|th=-ər) also bleth·er (blĕ-=…|th=--)intr.v. blath·ered, blath·er·ing, blath·ers also bleth·ered or bleth·er·ing or bleth·ers
To talk nonsensically.
n.
Nonsensical talk.
[Old Norse bladhra; see bhlē- in the Appendix of Indo-European roots.]
blather·er n.