Webster's Revised Unabridged Dictionary · 1913

Insentient

Insentient , adjective

Not sentient; not having perception, or the power of perception; devoid of feeling, consciousness and animation; inanimate; as, insentient stone. Opposite of sentient.
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
2.
incapable of sensation.