unsustainable
Americanadjective
Other Word Forms
- unsustainably adverb
Etymology
Origin of unsustainable
1670–80; un- 1 + sustainable ( def. )
Explanation
If something is unsustainable, there's just no way to keep doing it at the same rate or in the same way. You've been able to keep your new puppy from whining by petting her all night long, but that's unsustainable. When you can bear something, or continue it, it's sustainable, from the Latin root sustinere, "bear or endure." Unsustainable things can't go on, like unsustainable economic growth that's bound to level out or drop eventually, or an unsustainable expectation that you will always have a perfect grade point average. When it comes to the environment, practices that cause long-term harm or deplete resources are also unsustainable: "Ending unsustainable fishing practices successfully revived the salmon population."
Vocabulary lists containing unsustainable
Power Prefix: un-
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Organisms and Environments 1: The Environment
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Florida's B.E.S.T. Common Prefixes: un-
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
That implies a more than $25 billion exiting run rate of capex by the end of the year, which they “characterize as runaway, unsustainable, and highly suggestive of an advisable equity capital raise.”
From MarketWatch • Apr. 24, 2026
Spanish Prime Minister Pedro Sanchez called China's trade imbalance with the European Union "unsustainable" on Monday, as he began a three-day visit to Beijing where he hopes to strengthen economic ties.
From Barron's • Apr. 12, 2026
If it’s uncomfortable or unsustainable to live with continuously, ask your body why — and how it can help you make decisions that are the kindest possible to your nervous system.
From Los Angeles Times • Apr. 10, 2026
Mark Maguire, a farmer from the Monaghan-Fermanagh border who has been part of the protests, told BBC Radio Ulster's Good Morning Ulster programme that fuel costs are unsustainable for his sector.
From BBC • Apr. 10, 2026
In any society built on institutionalized racism, race-mixing doesn’t merely challenge the system as unjust, it reveals the system as unsustainable and incoherent.
From "Born a Crime: Stories from a South African Childhood" by Trevor Noah
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
