from
The Collaborative International Dictionary of English v.0.48
Drivel \Driv"el\, v. i. [imp. & p. p. {Driveled}or {Drivelled};
p. pr. & vb. n. {Driveling} or {Drivelling}.] [Cf. OE.
dravelen, drabelen, drevelen, drivelen, to slaver, and E.
drabble. Cf. {Drool}.]
1. To slaver; to let spittle drop or flow from the mouth,
like a child, idiot, or dotard.
[1913 Webster]
2. [Perh. a different word: cf. Icel. drafa to talk thick.]
To be weak or foolish; to dote; as, a driveling hero;
driveling love. --Shak. Dryden.
[1913 Webster]