blather
Concise Oxford English Dictionary © 2008 Oxford University Press:
blather /ˈblaðə/ (also blither)
▶verb talk at length without making much sense. ▶noun rambling but empty talk.
– origin ME (orig. Scots and northern English dial.): from ON blathra ‘talk nonsense’, from blathr ‘nonsense’.
'blather' also found in these Oxford entries:

