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English definition of “unsustainable”

unsustainable

adjective     /ˌʌnsəˈsteɪnəbəl/
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 adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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