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Definitions

unsustainable

[uhn-suh-stey-nuh-buhl] / ˌʌn səˈsteɪ nə bəl /
ADJECTIVE
not able to be supported in the future
Synonyms
Antonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

It has done so on heightened inflation fears and on concerns that the U.S. public debt is on an unsustainable path.

From Barron's • Jun. 16, 2026

In 2015 Höttges publicly called his discounting unsustainable.

From The Wall Street Journal • Jun. 10, 2026

He sees a high rate of capex acceleration that, he said, is unsustainable in 2027, even if overall spending remains high.

From MarketWatch • Jun. 3, 2026

Such a boom-bust cycle is unsustainable, but Howe previously thrived when he had had the luxury of extended clear periods to prepare for Premier League games throughout the season.

From BBC • May 27, 2026

Thus language-games do not simply succeed, progress, pay, or prove their worth; they can also become unsustainable if the facts change.

From "The Invention of Science" by David Wootton



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