adjective
An adjective is a word that describes or modifies a noun or pronoun. In this case, 'unsustainable' describes something that cannot be maintained or continued at its current rate or level.
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The current rate of deforestation is unsustainable and will have long-term negative effects on the environment.
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Spending more money than you earn is unsustainable in the long run.
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Eating fast food every day is just not sustainable for your health.
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Ignoring the warning signs of climate change is like driving full speed towards an unsustainable future.