[uhn-suh-stey-nuh-buh l]


not sustainable; not to be supported, maintained, upheld, or corroborated.

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. 2019

Examples from the Web for unsustainable

Contemporary Examples of unsustainable

Historical Examples of unsustainable

Word Origin and History for unsustainable

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

Online Etymology Dictionary, © 2010 Douglas Harper