Noah Webster's 1828 American Dictionary of the English Language is regarded by many as the finest English
dictionary ever published. The dictionary is available in many forms. I made the content available here for my own purposes,
out of personal admiration for this particular dictionary.
IMPASSIBIL'ITY IMPAS'SIBLE, a. [L. impassibilis, from passus, patior, to suffer.] Incapable of pain, passion or suffering; that cannot be affected with pain or uneasiness. Whatever is destitute of sensation is impassible. Though naked and impassible, depart.
impassibility appears in definitions for these words: