Apart from this insuperable antipathy to her, Princess Mary was agitated just then because on the Rostovs’ being announced, the old prince had shouted that he did not wish to see them, that Princess Mary might do so if she chose, but they were not to be admitted to him.
The last backwash of the movement from the west occurs: a backwash which serves to solve the apparently insuperable diplomatic difficulties and ends the military movement of that period of history.
There are no more uses of "insuperable" in the book.
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This objection would be insuperable if Homer had been an Ithakan.
Homer -- The Odyssey
I came to the conclusion that difficulties, well-nigh insuperable, lay between me and the safe possession of the beautiful little vessel.