O honour and mirror of the Spanish nation! may God Almighty in his infinite power grant that any person or persons, who would impede or hinder thy third sally, may find no way out of the labyrinth of their schemes, nor ever accomplish what they most desire!
There are no more uses of "impede" in the book.
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She is impeding the progress of our project
But the hill was treacherously steep; he was impeded by the snow and his own lack of strength.