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Definition of “unsustainable” - English Dictionary

"unsustainable" in British English

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unsustainableadjective

uk   us   /ˌʌn.səˈsteɪ.nə.bəl/
(Definition of unsustainable from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

"unsustainable" in Business English

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unsustainableadjective

uk   us   /ˌʌnsəˈsteɪnəbəl/
that cannot continue at the same ​rate: They are suffering a serious ​increase in ​inflation and an unsustainable ​boom in ​houseprices.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 ​taxincreases 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)
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“unsustainable” in Business English

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