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  1. Dictionary
    Un·sus·tain·a·ble
    /ˌənsəˈstānəb(ə)l/

    adjective

    • 1. not able to be maintained at the current rate or level: "macroeconomic instability led to an unsustainable boom"
  1. Searches related to define unsustainable

    define unsustainable developmentdefine sustainable