the GNU version of the Collaborative International Dictionary of English
adj. 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.
The Century Dictionary and Cyclopedia
Incapable of suffering; insensible to pain or harm.
Not to be moved to passion or sympathy; having or exhibiting no emotion.
Word Usage
"Many streets on the city's south side were described as impassible, littered with downed trees and utility poles."