insentient

Having no consciousness or feeling; inanimate.

[O]ver her flayed, exposed soul of a young girl who had gone open and warm to give herself to the children, there set a hard, insentient thing, that worked mechanically according to a system imposed.

Insensitive, indifferent.

His thought is tied, the curving prow / Of motion moored to rock; / And minutes burst upon a brow / Insentient to shock.