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 "frugal" in the book.
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A good salary and frugal spending habits led to a large bank account.
She was raised with frugal habits and always orders tap water to drink at a restaurant.