unsurmountable
un·sur·moun·table
adjective
1.
not capable of being surmounted or overcome
- “insurmountable disadvantages”
2.
impossible to surmount or climb
Origin
From un- + surmountable.
Related words
See also
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.