insurmountable

[in-ser-moun-tuh-buhl]
adjective
incapable of being surmounted, passed over, or overcome; insuperable: an insurmountable obstacle.

Origin:
1690–1700; in-3 + surmountable

insurmountability, insurmountableness, noun
insurmountably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insurmountable (ˌɪnsəˈmaʊntəbəl)
 
adj
incapable of being overcome; insuperable
 
insurmounta'bility
 
n
 
insur'mountableness
 
n
 
insur'mountably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

insurmountable
1696, from in- "not" + surmountable (see surmount).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
People who have suffered an emotional trauma or a brain injury often find
  housecleaning an insurmountable task.
One problem that may be insurmountable is the difference in cultures between
  high school and college.
But the real differences between the two sides may be insurmountable.
Soon you'll be doing filthy tricks that you once dreamed were insurmountable.
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