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unsustainable

[uhn-suh-stey-nuh-buh l] /ˌʌn səˈsteɪ nə bəl/
adjective
1.
not sustainable; not to be supported, maintained, upheld, or corroborated.
Origin of unsustainable
1670-1680
1670-80; un-1 + sustainable
Related forms
unsustainably, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for unsustainable
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Contemporary definitions for unsustainable
adverb

for a very long or indefinitely long time

Examples

He stayed out until the cows came home.

Word Origin

1610

Usage Note

informal

Dictionary.com's 21st Century Lexicon
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Word Origin and History for unsustainable
adj.

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

Online Etymology Dictionary, © 2010 Douglas Harper
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Difficulty index for unsustainable

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Word Value for unsustainable

0
21
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