Definition of “unsustainable” - English Dictionary

“unsustainable” in English

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uk /ˌʌn.səˈsteɪ.nə.bəl/ us /ˌʌn.səˈsteɪ.nə.bəl/

(Definition of “unsustainable” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“unsustainable” in Business English

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uk /ˌʌnsəˈsteɪnəbəl/ us

that cannot continue at the same rate:

They are suffering a serious increase in inflation and an unsustainable boom in house prices.
unsustainable level/pace/rate Public borrowing had reached an unsustainable level of 8% of GDP.
unsustainable debt/deficit The economy is running an unsustainable deficit, making tax increases inevitable.

NATURAL RESOURCES causing damage to the environment by using more of something than can be replaced naturally:

Unsustainable logging of commercial forests is threatening the industry's survival beyond 10-15 years.
In March, 50,000 people took to the streets of Mallorca to protest the island's unsustainable development.

(Definition of “unsustainable” from the Cambridge Business English Dictionary © Cambridge University Press)