...This is a very frequent error committed in our intercourse with savage nations, who are as pertinacious of their rights as the monarchs of Europe... 
Captain Frederick Marryat 「The Mission; or Scenes in Africa」
...The flies were an intolerable nuisance, not that they wereextraordinarily numerous, but so insufferably pertinacious...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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