Definition of "drivelling"

He continued his chat with Sir James about the poachers until they were all seated, and Mrs. Cadwallader, impatient of this drivelling, said— “I’m dying to know the sad news. The gamekeeper is not shot: that is settled. What is it, then?”

1871–1872, George Eliot [pseudonym; Mary Ann Evans], chapter LXXXIV, in Middlemarch […], volumes (please specify |volume=I to IV), Edinburgh, London: William Blackwood and Sons, book VIII