im·pas·si·ble /(ˌ)ɪmˈpæsəbəl/
  (a.)不覺痛苦的,無感覺的,無感情的
  Im·pas·si·ble a.  Incapable of suffering; inaccessible to harm or pain; not to be touched or moved to passion or sympathy; unfeeling, or not showing feeling; without sensation. “Impassible to the critic.”
  Secure of death, I should contemn thy dart
  Though naked, and impassible depart.   --Dryden.
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