1.  bluntness(n = noun.attribute) - the quality of being direct and outspoken; "the bluntness of a Yorkshireman"
is a kind of inconsiderateness, inconsideration, thoughtlessness
Derived form adjective blunt₃

2.  bluntness(n = noun.attribute) dullness - without sharpness or clearness of edge or point; "the dullness of the pencil made his writing illegible"
is a kind of configuration, conformation, contour, form, shape
has particulars: obtuseness
Derived forms adjective blunt₂, adjective blunt₁

1.  Want of edge or point; dullness; obtuseness; lack of sharpness. [1913 Webster]
"The multitude of elements and bluntness of angles." [1913 Webster]

2.  Abruptness of address; rude plainness. Boyle. [1913 Webster]

N  bluntness, blunt, obtuse, dull, bluff, edentate, toothless.