...For by your inhuman treatment of the unfortunate Africans there, you create the same insuperable impediments to a conversion... 
Thomas Clarkson 「An Essay on the Slavery and Commerce of the Human Species, Particularly the African」
...God has interposed an insuperable obstacle to any such result...
Frederick Douglass 「My Bondage and My Freedom」
...Commander Peary had taken the North Pole by conquest, in the face ofalmost insuperable natural difficulties, by the tremendousfighting-power of himself...
Matthew A. Henson 「A Negro Explorer at the North Pole」
...He was the son of Catherine, adaughter of Giotto, and possessed a genius for penetrating into thedifficulties of the art, and an insuperable desire of conquering them...
Luigi Antonio Lanzi Thomas Roscoe 「The History of Painting in Italy, Vol. 1 (of 6)」
...Butenthusiasm and genius know no insuperable difficulties...
Robert Stawell Ball 「The Story of the Heavens」
...There is, however, a still graver and quite insuperable distinctionbetween the parallactic path and the aberrational path...
Robert Stawell Ball 「The Story of the Heavens」
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