... “They would be immense, infinite, terrific, insurmountable, if, as I have said, all things did not concur to render them of absolutely no account... 
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...In the zenith of his strength and of insurmountable good luck you and all your myrmidons and all the assembled guard of Paris would have had no power over him...
Baroness Orczy 「El Dorado」
... Besides, the fox had now made for a dense forest which lay before, and he saw difficulties in that direction which to him appeared insurmountable...
William Wells Brown 「Clotelle」
...Should it fall across the isthmus, it would form an insurmountable barrier to their enemies...
Mayne Reid 「The Giraffe Hunters」
...A more fundamental one still, which the writerfeels may prove insurmountable, is based on a law of nature which weare bound to accept...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...Thehundred and fifty pounds of dead weight which the manager of themachine must add to it over and above that necessary in the bird maywell prove an insurmountable obstacle to success...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
... in order to decide by a single word the most insurmountable difficulties which theology presents to us on all sides...
Jean Meslier Anna Knoop 「Superstition In All Ages (1732)」
...This range had for years presented an insurmountable barrier...
Alexander Sutherland 「History of Australia and New Zealand」
..., have constantly proved insurmountable...
Matthew Flinders 「A Voyage to Terra Australis」
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