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What is "unsustainable"

Longman Dictionary of Contemporary English
unsustainable
adjective
EXAMPLES FROM CORPUS
▪ Instead, successive presidents continued to promise prosperity and to dole out unsustainable subsidies.
▪ Maybe the age of leisure will turn out to be a brief and unsustainable interlude rather than a new dawn after all.
▪ Nurse education and training at Horton would be likely to become unsustainable without a sufficient variety of placements for students.
▪ Past policies favouring over-valued currencies have proved unsustainable.
▪ Self-determination has, as Lansing predicted all those years ago, raised hopes to an unsustainable level.
▪ While the number of levels has endured, the rationale turned out to be unsustainable.
Douglas Harper's Etymology Dictionary
unsustainable

1670s, from un- (1) "not" + sustainable (adj.).

Wiktionary
unsustainable

a. Not sustainable

Usage examples of "unsustainable".

Some historians still argue that the Swedish Empire really collapsed only when Charles XII finally lost to Peter the Great, but the fact is that it was ultimately unsustainable simply because it lacked the financial and population bases to support it, especially against the inevitable coalitions of nations with larger populations and deeper pockets.

Briefly, he debated planting a lie, but because in his experience lies tended to grow until they became unsustainable, he told the truth.

I must set the example by carrying the word to the greatest global center of unsustainable industry.

As for bombing that telepath, if it worked at all it would put the econo-war on an unsustainable primitive level.

When the back end caught up with the front, and the beam had theoretically no length at all, it became an unsustainable singularity that broke up in an instantaneous release of all its concentrated energy.

Instead, she woke up to the truth: Gaia was under attack by an infestation of human rats feeding on the carnage of unsustainable technological explosions that tore through the body of the Goddess like bullets, blood oozing from the ruptured web of life.

The government never acknowledged his proposals, the country did not succumb to the terror of the car bombs, and the police offensive reached unsustainable proportions.

With its priestesses and its orgies and its cottage industries, its secret reliance on the wider economy of New Crobuzonthe vastness of which was usually depicted airily as a kind of adjunct to KinkenLin realized that she was living in an unsustainable realm.