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unsustainable

[uhn-suh-stey-nuh-buh l]
adjective
  1. not sustainable; not to be supported, maintained, upheld, or corroborated.
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Origin of unsustainable

1670–80; un-1 + sustainable
Related formsun·sus·tain·a·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for unsustainably

unsustainable

adj.

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

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Online Etymology Dictionary, © 2010 Douglas Harper