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Related to unsurmountable: insurmountable
(of a problem, etc) not capable of being solved or overcome
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|Adj.||1.||unsurmountable - not capable of being surmounted or overcome; "insurmountable disadvantages"|
unconquerable - not capable of being conquered or vanquished or overcome; "a tribute to his courage...and his unconquerable will"- R.E.Danielson; "faced unconquerable difficulties"
impossible - not capable of occurring or being accomplished or dealt with; "an impossible dream"; "an impossible situation"
|2.||unsurmountable - incapable of being surmounted or climbed|