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.

Not sustainable
“It is understood the company was losing money on a weekly basic and they found this to be unsustainable in the long term.”
(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
Incapable of being helped
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