from
The Collaborative International Dictionary of English v.0.48
Impassible \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.
[1913 Webster]
Secure of death, I should contemn thy dart
Though naked, and impassible depart. --Dryden.
[1913 Webster]