Dictionary.com
Thesaurus.com
Synonyms

unsustainable

American  
[uhn-suh-stey-nuh-buhl] / ˌʌn səˈsteɪ nə bəl /

adjective

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

Other Word Forms

  • unsustainably adverb

Etymology

Origin of unsustainable

1670–80; un- 1 + sustainable ( def. )

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.