Find Antonyms
unsustainably Antonyms
Opposite of unsustainably
Because the opposite of unsustainably shifts with each meaning, the antonyms and opposite words below are separated across 2 exact definitions and ranked by contrast strength.
• adverb (Context 1)
In a manner or at a rate that cannot be maintained, continued, or supported over the long term without exhausting resources or causing severe harm.
Usage Example
"The region has been drawing water from its underground aquifers sustainably for decades."
Strongest
sustainably
Strong
viably
• adverb (Context 2)
In a way that cannot be defended, justified, or upheld against criticism or legal scrutiny.
Usage Example
"The defense counsel argued that the prosecution's claims were sustainably broad and lacked material evidence."
Strongest
sustainably
defensibly
tenably
Strong
justifiably
Similar words to unsustainably
Words similar to unsustainably shift depending on context. Common synonyms include:
untenably
indefensibly
unjustifiably
unviably
excessively
• Nearby Words
Cite this Entry
Wordmom. (2026). Antonyms for Unsustainably. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/unsustainably