The Collaborative International Dictionary of English v.0.48:

Blunt \Blunt\, v. t. [imp. & p. p. Blunted; p. pr. & vb. n.
   Blunting.]
   1. To dull the edge or point of, by making it thicker; to
      make blunt. --Shak.
      [1913 Webster]

   2. To repress or weaken, as any appetite, desire, or power of
      the mind; to impair the force, keenness, or
      susceptibility, of; as, to blunt the feelings.
      [1913 Webster]