Costiveness \Cos"tive*ness\, n. 1. An unnatural retention of the fecal matter of the bowels; constipation. [1913 Webster] 2. Inability to express one's self; stiffness. [Obs.] [1913 Webster] A reverend disputant of the same costiveness in public elocution with myself. --Wakefield. [1913 Webster]