"Then," said he, "you are ready to pay the official visits, which are absolutely indispensable?"
He folded up the accusation quietly, and put it as quietly in his pocket; read the examination, and saw that the name of Noirtier was not mentioned in it; perused, too, the application dated 10th April, 1815, in which Morrel, by the deputy procureur’s advice, exaggerated with the best intentions (for Napoleon was then on the throne) the services Dantes had rendered to the imperial cause—services which Villefort’s certificates rendered indispensable.
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.