unsustainable

[ uhn-suh-stey-nuh-buh l ]
/ ˌʌn səˈsteɪ nə bəl /

adjective

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

Origin of unsustainable

1670–80; un-1 + sustainable

Related forms

un·sus·tain·a·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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