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comparative more indispensable, superlative most indispensable
(ecclesiastical, obsolete) Not admitting ecclesiastical dispensation; not subject to release or exemption; that cannot be allowed by bending the canonical rules.
(of duties, rules etc.) Unbendable, that cannot be set aside or ignored. quotations examples
The law was moral and indispensable.
1679–1715, Gilbert Burnet, “(please specify the page)”, in The History of the Reformation of the Church of England., London: […] T[homas] H[odgkin] for Richard Chiswell, […]
Absolutely necessary or requisite; that one cannot do without. quotations examples
But through the oligopoly, charcoal fuel proliferated throughout London's trades and industries. By the 1200s, brewers and bakers, tilemakers, glassblowers, pottery producers, and a range of other craftsmen all became hour-to-hour consumers of charcoal. This only magnified the indispensable nature of the oligopolists.
2006, Edwin Black, chapter 2, in Internal Combustion
And my friends in politics, no-one is remotely indispensable and our brilliant and Darwinian system will produce another leader, equally committed to taking this country forward through tough times.
7 July 2022, Boris Johnson, resignation speech
plural indispensables
A thing that is not dispensable; a necessity. examples
(in the plural, colloquial, dated) Trousers. examples