Unsustainable (adjective)

Not able to be maintained or continued over time without causing harm or depletion.

Origin:

From un- (not) + sustainable (able to be maintained or continued over time).

Examples:

1. The current rate of deforestation is unsustainable and will lead to long-term ecological damage.
2. The company's business model was unsustainable and it eventually went bankrupt.
3. The use of fossil fuels is unsustainable and must be phased out in favor of renewable energy.
4. The fishing practices were unsustainable and led to the depletion of fish stocks.
5. The water consumption was unsustainable and led to water scarcity.