Insentient
Pronunciation : In*sen"ti*ent
Part of Speech : a.
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913