from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Not subject to suffering, pain, or harm.
- adj. Unfeeling; impassive.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Unable to suffer, or feel pain.
- adj. Unable to feel emotion; impassive.
- adj. Incapable of suffering injury or detriment.
from 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.
from 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.
Middle English, from Old French, from Late Latin impassibilis : in-, not; see in-1 + passibilis, passible; see passible.(American Heritage® Dictionary of the English Language, Fourth Edition)
From French impassible. (Wiktionary)