Source : Webster's Revised Unabridged Dictionary (1913)

Driveler \Driv"el*er\, n.
   A slaverer; a slabberer; an idiot; a fool. [Written also
   {driveller}.]

Source : WordNet®

driveller
     n 1: someone whose talk is trivial drivel [syn: {jabberer}]
     2: a person who dribbles; "that baby is a dribbler; he needs a
        bib" [syn: {dribbler}, {slobberer}, {drooler}]