Meaning of “unsustainable” - Learner’s Dictionary

unsustainable

adjective uk us /ˌʌnsəˈsteɪnəbəl/

Something that is unsustainable cannot continue at the same rate

causing damage to the environment by using more of something than can be replaced naturally:

unsustainable fishing methods

(Definition of “unsustainable” from the Cambridge Learner’s Dictionary © Cambridge University Press)