Im*pas"si*ble (?), a. [L. impassibilis; pref. im- not + passibilis passable: cf. F. impassible. See Passible.]
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." Sir W. Scott.
Secure of death, I should contemn thy dart
Though naked, and impassible depart.
© Webster 1913