It is true I have no longer to maintain a dear grandmother who died in her hundred and second year, but enough remains to render it indispensable that the mill should be always going.
He had married a meek little dancing-mistress, with a tolerable connexion (having never in his life before done anything but deport himself), and had worked her to death, or had, at the best, suffered her to work herself to death, to maintain him in those expenses which were indispensable to his position.
"My dear George," returns his brother, "is it so indispensable that you should undergo that process?"
There are no more uses of "indispensable" in the book.
Show samples from other sources
Then a big pot was brought out as we raced to retrieve our indispensable spoons and bowls.
Leon Leyson -- The Boy on the Wooden Box
In fourteen years in Bluffton he had sired two sons and managed to worm his way so completely into Bennington’s life and make himself so indispensable that he sometimes seemed like Bennington’s third leg.