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 But the constant challenge of trying to unite Fox Sports’ more traditional show with Barstool’s persona proved unsustainable. — Andrew Marchand, New York Times, 3 Oct. 2026 When deficits and the debt-to-GDP ratio reach unsustainable highs, bond buyers conclude that the government’s current policies are not credible and must change. — Steve H. Hanke, Fortune, 2 Oct. 2026 Debt concerns have also weighed on the bond market, as massive government spending from both political parties is putting the country on an unsustainable fiscal path. — David Goldman, CNN Money, 1 Oct. 2026 The country, which was already losing too many troops, began incurring casualties that seemed unsustainable. — Dmytro Kuleba, Foreign Affairs, 30 Sep. 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

No working of any system or joy gathered from an unprovable satirical angle.

— Sean Joseph OutKick, FOXNews.com, 8 Oct. 2026
Hollywood has long been a petri dish of nasty rumors, and throughout its history, several unproven, or unprovable, salacious stories about movie stars have taken on lives of their own.

— Julian Sancton, HollywoodReporter, 17 Sep. 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 20 Oct. 2026.

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Synonyms of unsustainable

adjective

Example Sentences

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