Source : Webster's Revised Unabridged Dictionary (1913)

Riddle \Rid"dle\, v. t. [imp. & p. p. {Riddled}; p. pr. & vb. n.
   {Riddling}.]
   1. To separate, as grain from the chaff, with a riddle; to
      pass through a riddle; as, riddle wheat; to riddle coal or
      gravel.

   2. To perforate so as to make like a riddle; to make many
      holes in; as, a house riddled with shot.

Source : WordNet®

riddled
     adj 1: (often followed by `with') damaged throughout by numerous
            perforations or holes; "a sweater riddled with moth
            holes"; "cliffs riddled with caves"; "the
            bullet-riddled target"
     2: spread throughout; "cities riddled with corruption"