The Collaborative International Dictionary of English v.0.48:

left-slanting \left-slanting\ adj.
   slanting toward the left; -- of handwriting.

   Note: Such handwriting is usually found in left-handed
         writers
         [WordNet 1.5]

WordNet (r) 3.0 (2006):

left-slanting
    adj 1: (of handwriting) having the letters slanting backward
           [syn: backhand, left-slanting]