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 Industry leaders say the change could drive labor costs to unsustainable levels, potentially forcing businesses to close. — Naomi Taxay, Sacbee.com, 3 Aug. 2026 Lessons from Singapore and Japan Singapore and Japan are demonstrations of how rising healthcare costs are not the same thing as unsustainable healthcare costs. — Runchana Pongsaparn, Fortune, 31 July 2026 That community is now telling its Board, in the clearest terms available, that the current path is unsustainable. — Elizabeth Cooney, STAT, 28 July 2026 Meanwhile, top players, who tend to go deep at these longer events, say the calendar is increasingly unsustainable despite the financial benefits attached. — Matthew Futterman, New York Times, 25 July 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

When every competitor makes the identical, unverifiable promise, the promise stops carrying information.

— Amir Tarighat, Forbes.com, 31 July 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 7 Aug. 2026.

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Synonyms of unsustainable

adjective

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