Synonyms of sustainable

sustainable

adjective

sə-ˈstā-nə-bəl 

1

as in justifiable

capable of being defended with good reasoning against verbal attack

a line of argument that is probably not sustainable in a public forum against skilled debaters

Synonyms & Similar Words

• justifiable
• viable
• acceptable
• legitimate
• maintainable
• supportable
• defendable
• rational
• defensible
• tenable
• reasonable
• sensible
• allowable
• verifiable
• admissible
• unobjectionable
• well-grounded
• provable
• explainable
• explicable
• warrantable
• passable
• exceptionable
• confirmable

Antonyms & Near Antonyms

• untenable
• unjustifiable
• irrational
• ridiculous
• unsustainable
• absurd
• extreme
• unreasonable
• illogical
• unsound
• indefensible
• outrageous
• unacceptable
• objectionable
• insupportable
• unfounded
• inexplicable
• groundless
• unexplainable

2

as in verifiable

capable of being proven as true or real

has no sustainable claim to the property without a deed or some other document

Synonyms & Similar Words

• verifiable
• supportable
• demonstrable
• empirical
• confirmable
• defensible
• justifiable
• provable
• documentable
• checkable
• excusable
• warrantable
• certifiable
• alleged
• well-founded
• presumed
• assumed
• vindicable
• guessed
• suspected
• conjectured
• surmised

Antonyms & Near Antonyms

• unsustainable
• unsupportable
• insupportable
• unverifiable
• unprovable
• debatable
• indemonstrable
• disputable
• refutable
• disprovable

3

as in endurable

capable of being endured

the general didn't think that such heavy casualties could be sustainable for much longer

Synonyms & Similar Words

• endurable
• sufferable
• tolerable
• supportable
• acceptable
• bearable
• survivable
• livable
• adequate
• satisfactory
• allowable
• reasonable
• permissible
• admissible

Antonyms & Near Antonyms

• intolerable
• painful
• bad
• terrible
• unbearable
• cruel
• horrible
• unfortunate
• awful
• vicious
• unacceptable
• harsh
• dire
• appalling
• hideous
• shocking
• dreadful
• monstrous
• gruesome
• vile
• wretched
• rotten
• ghastly
• horrifying
• horrid
• intense
• acute
• extreme
• nightmarish
• horrendous
• frightful
• grisly
• macabre
• lurid
• agonizing
• unsupportable
• nasty
• harrowing
• excruciating
• insupportable
• unendurable
• insufferable
• offensive
• torturous
• deplorable
• repugnant
• repulsive
• disgusting
• evil
• abhorrent
• revolting
• distasteful
• loathsome
• obnoxious
• sickening
• noxious
• heinous
• tormenting
• abominable
• unspeakable
• foul
• odious
• piercing
• nauseating

Example Sentences

Recent Examples of sustainable

Although individual temperature variations are small, the immense sheer volume and broad availability make this energy a untapped resource for sustainable electricity production. — Mrigakshi Dixit, Interesting Engineering, 8 Oct. 2026

Retention, wellbeing, and sustainable workload management are more important than ever. — Tony Kirtley, Fortune, 8 Oct. 2026

Reducing the extra payment to a sustainable amount, though, can help prevent that pattern. — Angelica Leicht, CBS News, 7 Oct. 2026

The Dodgers scored all 10 runs in the first three games via the long ball, which isn’t necessarily sustainable without traffic on the bases. — Maddie Lee, Los Angeles Times, 7 Oct. 2026