The Collaborative International Dictionary of English v.0.48:

Costiveness \Cos"tive*ness\, n.
   1. An unnatural retention of the fecal matter of the bowels;
      constipation.
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   2. Inability to express one's self; stiffness. [Obs.]
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            A reverend disputant of the same costiveness in
            public elocution with myself.         --Wakefield.
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