Had there been a family to provide for, Mrs. Norris might never have saved her money; but having no care of that kind, there was nothing to impede her frugality, or lessen the comfort of making a yearly addition to an income which they had never lived up to.
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.