Source : Webster's Revised Unabridged Dictionary (1913)

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.

   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.

Source : WordNet®

drivel
     n 1: a worthless message [syn: {garbage}]
     2: saliva spilling from the mouth [syn: {drool}, {dribble}, {slobber}]
     v : let saliva drivel from the mouth; "The baby drooled" [syn: {drool},
          {slabber}, {slaver}, {slobber}, {dribble}]
     [also: {drivelling}, {drivelled}]

drivelling
     See {drivel}