UNSUSTAINABLE Synonyms: 26 Similar and Opposite Words

unsustainable

adjective

Definition of unsustainable

as in unsupportable

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Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of unsustainable The current fiscal trajectory in the US is unsustainable, and the debt service burden has grown large enough to squeeze out other spending. — Bill Stone, Forbes.com, 22 Aug. 2026 The Salvation Army says that the store’s financial performance failed to generate enough money to support the agency’s adult rehabilitation program and that keeping it open would be financially unsustainable. — Vince Basada, Sacbee.com, 21 Aug. 2026 Analysts who spoke to ABC News acknowledged the difficulty in predicting when the most severe effects of the ballooning debt may materialize but warned that regardless of the answer, the current trajectory is unsustainable. — Max Zahn, ABC News, 20 Aug. 2026 Debt hawks have been warning policymakers for some time that the nation’s fiscal path is unsustainable, and the issue is increasingly rising up voters’ agendas in the run-up to midterms later this year. — Eleanor Pringle, Fortune, 20 Aug. 2026 See All Example Sentences for unsustainable

Recent Examples of Synonyms for unsustainable

Adjective

Currah’s opinion piece is wrong on the facts, the law, and the science, and reaches unsupportable conclusions.

— Paisley Currah, The New York Review of Books, 18 Dec. 2025
The venerable but troubled outlet has been for sale since its previous owners ran up unsupportable debts and were removed in 2023.

— Tom Chivers, semafor.com, 24 Nov. 2025

Definition of unsupportable

Adjective

Such a mind might fail an unverifiable consciousness test at the same time that its persistent interests start to boldly assert themselves.

— Andréa Morris, Forbes.com, 10 Aug. 2026
The most reliable move when labels feel unverifiable is to buy directly from a farmer or producer who can describe their practices.

— Anne Wolf, Martha Stewart, 26 July 2026

Definition of unverifiable

Adjective

Without that data, the patterns become invisible — or at least, unprovable.

— Maia Niguel Hoskin, Forbes.com, 25 June 2026
The meat of the documentary is the different SNL presidents talking about their individual impressions, their origins and their causally unprovable impacts on the perception of those presidents.

— Daniel Fienberg, HollywoodReporter, 10 June 2026

Definition of unprovable

Browse Nearby Words

unsuspicious

unsustainable

unswathe

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“Unsustainable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unsustainable. Accessed 3 Sep. 2026.

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Synonyms of unsustainable

adjective

Example Sentences

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