UNSUSTAINABLE Synonyms: 26 Similar and Opposite Words

unsustainable

adjective

Definition of unsustainable

as in unsupportable

Related Words

Relevance

Dissimilar Words

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 Although that number was inherently unsustainable, the biggest problem isn’t that a district that has experienced significant enrollment decline was planning to reduce its teaching force. — David Griffith, Chicago Tribune, 25 Aug. 2026 Raman contends that Bass’ signature program Inside Safe, which dismantles encampments and moves people living there into motels, hotels and interim housing, is overly expensive and unsustainable. — Los Angeles Times, 23 Aug. 2026 There is no justification for American deaths in the name of the unsustainable and impractical goal of total military dominance, let alone unnecessary wars of choice. — Alexander Langlois, The Orlando Sentinel, 23 Aug. 2026 And many Fed leaders have said for a long time that the debt trajectory is on an unsustainable path. — CBS News, 23 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

See all Nearby Words

Cite this Entry

Style

“Unsustainable.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unsustainable. Accessed 5 Sep. 2026.

Copy Citation

Synonyms of unsustainable

adjective

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster

Word of the Day

matriculate

Popular in Grammar & Usage

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

A List of Most Commonly Confused Words

Why do we use apostrophes to show possession?

Is it 'nerve-racking' or 'nerve-wracking'?

What's the difference between 'fascism' and 'socialism'?

Popular in Wordplay

The Longest Long Words List

Stay Woke

Ye Olde Nincompoop: Old-Fashioned Words for 'Stupid'

14 Phobias You Probably Haven't Heard Of

The Words of the Week - Sept. 4

Popular

A Who’s Who Regarding ‘Who’s’ and ‘Whose’

The Longest Long Words List

Stay Woke

Games & Quizzes