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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.

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Still, $40 trillion is a big number, likely to at least briefly draw attention to what economists broadly agree is an unsustainable fiscal trajectory.

From The Wall Street Journal Aug. 19, 2026

The MRT leader described the number of callouts on Friday as "almost unsustainable".

From BBC Aug. 10, 2026

LAUSD’s problems mirror those of other large urban school districts: unsustainable spending, particularly on administration and employee benefits, combined with shrinking enrollment.

From The Wall Street Journal Aug. 9, 2026

"Our capacity has been completely overwhelmed," Ceuta's vice-president Alejandro Ramirez told private television channel La Sexta on Thursday, describing the situation as "unsustainable".

From Barron's Aug. 6, 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



Vocabulary lists containing unsustainable


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