3 adjectives to describe indispensables

His destitution of these patriarchal indispensables is the more afflicting, when we consider his faithful discharge of responsibilities to his household, though so deplorably destitute of the needful aids.

Frequent private conferences were now held between Thorndyke, his two daughters, and Elizabeth Wareinga woman approaching middle-age, whom, under the specious pretence that Mrs. Thorndyke's increasing ailments rendered the services of an experienced matron indispensable, he had lately installed at the farm.

And this Act made the consent of the sovereign indispensable to the marriage of any member of the Royal Family except the descendants of princesses married to foreign princes.

3 adjectives to describe  indispensables