insurmountable

in- +‎ surmountable

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insurmountable (comparative more insurmountable, superlative most insurmountable)

1. Incapable of being passed over, surmounted, or overcome; insuperable

   Synonym: (archaic and rare) unsurmountable

   Antonym: surmountable

   Getting everybody to agree proved to be an insurmountable difficulty.

   • 2023 January 24, Justin McCurry, “Japan PM’s solution to dire birthrate has already been rejected by young”, in The Guardian‎:

     Overcoming Japan’s demographic crisis has proved insurmountable for occupants of the Kantei – the prime minister’s office – long before Kishida moved in last autumn.