obtusion

from The Collaborative International Dictionary of English v.0.48

Obtusion \Ob*tu"sion\, n. [L. obtusio, from obtundere to blunt.
   See {Obtund}.]
   1. The act or process of making obtuse or blunt.
      [1913 Webster]

   2. The state of being dulled or blunted; as, the obtusion of
      the senses. --Harvey.
      [1913 Webster]