Source : Webster's Revised Unabridged Dictionary (1913)

Bluntness \Blunt"ness\, n.
   1. Want of edge or point; dullness; obtuseness; want of
      sharpness.

            The multitude of elements and bluntness of angles.
                                                  --Holland.

   2. Abruptness of address; rude plainness. ``Bluntness of
      speech.'' --Boyle.

Source : WordNet®

bluntness
     n 1: the quality of being direct and outspoken; "the bluntness of
          a Yorkshireman"
     2: without sharpness of edge or point [syn: {dullness}, {dulness}]
        [ant: {asperity}, {sharpness}]