Definition of unsustainable adjective from the Oxford Advanced Learner's Dictionary

  

unsustainable

 adjective
adjective
BrE BrE//ˌʌnsəˈsteɪnəbl//
 
; NAmE NAmE//ˌʌnsəˈsteɪnəbl//
 
 
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that cannot be continued at the same level, rate, etc. unsustainable growth opposite sustainable
See the Oxford Advanced American Dictionary entry: unsustainable