voluble
Concise Oxford English Dictionary © 2008 Oxford University Press:
voluble /ˈvɒljʊb(ə)l/
▶adjective speaking or spoken incessantly and fluently.
– derivatives
volubility noun
volubly adverb.
volubility noun
volubly adverb.
– origin ME (in senses ‘rotating about an axis’ and ‘tending to change’): from Fr., or from L. volubilis, from volvere ‘to roll’.
'voluble' also found in these Oxford entries:

