insuperable

[in-soo-per-uh-buhl]
adjective
incapable of being passed over, overcome, or surmounted: an insuperable barrier.

Origin:
1300–50; Middle English < Latin insuperābilis. See in-3, superable

insuperability, insuperableness, noun
insuperably, adverb
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World English Dictionary
insuperable (ɪnˈsuːpərəbəl, -prəbəl, -ˈsjuː-)
 
adj
incapable of being overcome; insurmountable
 
insupera'bility
 
n
 
in'superableness
 
n
 
in'superably
 
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

insuperable
c.1340, from L. insuperabilis "that cannot be passed over, unconquerable," from in- "not" + superabilis "that may be overcome," from superare "to overcome," from superus "one that is above," from super "over" (see super-).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He met almost insuperable physical challenges with humor and grace.
Government debt, contrary to propaganda, is far from an insuperable problem.
These are significant hurdles but not insuperable ones.
If the problems present an insuperable barrier, nothing prevents the user from
  using a calculator.
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