from The Century Dictionary.
- noun The condition or quality of being indemonstrable.
from the GNU version of the Collaborative International Dictionary of English.
- noun The quality of being indemonstrable.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The quality of being
indemonstrable; impossibility of demonstration.
Sorry, no etymologies found.
Balfour's "Defense of Philosophic Doubt", based on the indemonstrability of ultimate truths, is an attempt in the same direction.
Kant was the first person, and perhaps the last, that ever undertook formally to demonstrate the indemonstrability of God.