unsustainable
Americanadjective
Other Word Forms
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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myPerspectives 7.4
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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.
So we should welcome AI tutors that could help reach the most vulnerable students and deliver high-quality instruction without unsustainable spending.
From The Wall Street Journal ● Sep. 11, 2026
And if even the big corporations can see that a diet of universally palatable slop is unsustainable and troubling, it’d be a shame to get left behind, comparing favorite Marvel moments with a chatbot.
From Salon ● Sep. 11, 2026
Anita Cleare, parenting expert and author of The Work/Parent Switch, said the overall cognitive drain spills over into our work lives and leads to unsustainable burnout.
From BBC ● Sep. 5, 2026
Raman contends that Bass’ signature program Inside Safe, which dismantles encampments and moves people living there into motels, hotels and interim housing, is overly expensive and unsustainable.
From Los Angeles Times ● Aug. 23, 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.
