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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.

Whilst this was "no secret", she described this rise as "unsustainable".

From BBC • Apr. 1, 2026

As the market has made clear in the first quarter, betting on Meta isn’t without risks: “Regulatory scrutiny persists, the trajectory of AI spending is unsustainable, and the macro remains treacherous,” White wrote.

From Barron's • Mar. 30, 2026

The government provides the loans to parents regardless of their income. and, since they could borrow up to the cost of attendance, the loans can leave families in an unsustainable position.

From MarketWatch • Mar. 27, 2026

Most team owners don’t think so, arguing that the disparity in revenues between big-market franchises and their smaller counterparts has become unsustainable, resulting in a fractured competitive landscape.

From The Wall Street Journal • Mar. 26, 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