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What is another word for unsustainable?

Need synonyms for unsustainable? Here's a list of similar words from our thesaurus that you can use instead.

Incapable of being maintained or used over a long period of time
“Generating power through the use of fossil fuels is both unsustainable and environmentally damaging.”
(especially of a position or view) Not able to be maintained or defended against attack or objection
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Very difficult to deal with
Too bad to be justified, excused or tolerated
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Incapable of being helped
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