Unsustainable synonyms | adjectives

Synonyms for Unsustainable as an Adjective

• untenable

  not able to be supported in the future
• indefensible
• unjustifiable
• unviable

  not able to be supported in the future
• unsuitable

  not able to be supported in the future
• unendurable

  not able to be supported in the future
• unverifiable
• weak
• unfeasible

  not able to be supported in the future
• brief
• fleeting
• temporary
• implausible
• unworkable
• insupportable
• unreasonable
• unfounded
• unsound
• unsupportable
• shaky
• unwarranted
• flawed
• wasteful
• unmaintainable
• unmanageable
• unsanctionable
• illogical
• unjustified
• flimsy
• inexcusable
• unpardonable
• unforgivable
• uncalled for
• unprovoked
• gratuitous
• unnecessary
• unacceptable
• unwarrantable
• wrong
• unprofitable
• uncommercial
• money-losing
• not viable
• worthless
• inefficient
• improvident
• invalid
• unconvincing
• tiring
• unbearable