Source : Webster's Revised Unabridged Dictionary (1913)

Obtund \Ob*tund"\, v. t. [imp. & p. p. {Obtunded}; p. pr. & vb.
   n. {Obtunding}.] [L. obtundere, obtusum; ob (see {Ob-}) +
   tundere to strike or beat. See {Stutter}.]
   To reduce the edge, pungency, or violent action of; to dull;
   to blunt; to deaden; to quell; as, to obtund the acrimony of
   the gall. [Archaic] --Harvey.

         They . . . have filled all our law books with the
         obtunding story of their suits and trials. --Milton.

Source : WordNet®

obtund
     v : reduce the edge or violence of; "obtunded reflexes"