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Impossible to surmount; insuperable: insurmountable difficulties.

in′sur·mount′a·bil′i·ty, in′sur·mount′a·ble·ness n.
in′sur·mount′a·bly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Travis Head and Aaron Finch began the day solidly enough, but the sheer insurmountability of the task that lay ahead brought its own constricting pressures.
In short, the insurmountability of this so-called Education Emergency, at the current trajectory, with the associated, deeply inefficient brick and mortar system, even with full government support and absolutely no corruption, is self-evident.
This myth is based on a perceived insurmountability of the requirement imposed on public figures to prove "actual" or "constitutional" malice by clear and convincing evidence when suing for defamation.
Hinged on a flimsy story comprised of contradictory reports and severely lacking in evidence, the incident was quickly dismissed due to the burden of proof's "insurmountability."
His use of a genetic heritage propagates neo-racist ideologies which assert a biological basis for the "insurmountability of cultural differences" (Balibar 21).
neoracism [...], whose dominant theme is not biological heredity but the insurmountability of cultural differences, a racism which, at first sight, does not postulate the superiority of certain groups or peoples in relation to others but "only" the harmfulness of abolishing frontiers, the incompatibility of life-styles and traditions.