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Definition of unsustainable

unsustainable

/ˌʌnsəˈsteɪnəbl/
un · sus · tain · a · ble
Adverb:unsustainably
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unsustainable Lexical Profile

unsustainable Game Scores & Validity

• adjective

1

Not able to be maintained at the current rate or level over a long period of time.

Example

"The company's rapid spending proved unsustainable once market demand began to slow down."

2

Causing damage to the environment by depleting natural resources faster than they can be replenished.

Example

"Unsustainable logging practices have severely reduced the region's ancient forest cover."

3

Not able to be upheld, defended, or justified against criticism or legal challenge.

Example

"The defense attorney's argument was dismissed by the judge as legally unsustainable."

Synonyms
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Antonyms
View all antonyms for unsustainable

• Rhymes for unsustainable

• Nearby Words

unsuspicious
unsuspiciously
unsustainability
unsustainable
unsustainably
unsustained
unswayed

Word Origin & Etymology

Formed in English from the prefix 'un-' (not) and 'sustainable', which derives via Old French from the Latin 'sustinere', meaning 'to hold up or support'.

Cite this Entry

Wordmom. (2026). Definition of Unsustainable. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/unsustainable
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