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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.

Estate agents have accused Rightmove of charging "unsustainable" fees, with some saying their charges have more than doubled in recent years.

From BBC • Apr. 1, 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

Team owners argue revenue disparity is unsustainable and advocate for a salary cap, citing fan support and the Los Angeles Dodgers’ success.

From The Wall Street Journal • Mar. 26, 2026

“I think that you would see a tax for any ship going through, something completely unsustainable in the international market.”

From Barron's • Mar. 24, 2026

In any society built on institutionalized racism, race-mixing doesn’t merely challenge the system as unjust, it reveals the system as unsustainable and incoherent.

From "Born a Crime: Stories from a South African Childhood" by Trevor Noah