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• a  devoid of feeling and consciousness and animation
  insentient (or insensate) stone

• There, with the ability to talk to the unresponsive living, his nerves "insentient now as string," he longs even for the pain of Hell.
• There, with the ability to talk to the unresponsive living, his nerves "insentient now as string," he longs even for the pain of Hell.

• insensate

• sentient