Unsurmountable
The Century Dictionary and Cyclopedia
Insurmountable.
the GNU version of the Collaborative International Dictionary of English
adjective.
Insurmountable.
Wiktionary, Creative Commons Attribution/Share-Alike License
adjective.
insurmountable
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
incapable of being surmounted or climbed
adjective.
not capable of being surmounted or overcome