Source : Webster's Revised Unabridged Dictionary (1913)

Insentiment \In*sen"ti*ment\, a.
   Not sentient; not having perception, or the power of
   perception.

         The . . . attributes of an insentient, inert substance.
                                                  --Reid.

         But there can be nothing like to this sensation in the
         rose, because it is insentient.          --Sir W.
                                                  Hamilton.