sustainable

1 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 defendable, defensible, justifiable, maintainable, supportable, tenableRelated Words rational, reasonable, sensible, well-grounded; acceptable, admissible, allowable, exceptionable, legitimate, passable, unobjectionable, viable, warrantable; confirmable, provable, verifiable; explainable, explicableNear Antonyms absurd, illogical, irrational, ridiculous, unsound; extreme, outrageous, unreasonable; groundless, objectionable, unacceptable, unfounded; inexplicable, unexplainableAntonyms indefensible, insupportable, unjustifiable, unsustainable, untenable

2 capable of being proven as true or real has no sustainable claim to the property without a deed or some other document Synonyms checkable, confirmable, demonstrable, empirical (also empiric), provable, supportable, verifiableRelated Words certifiable, documentable, well-founded; defensible, excusable, justifiable, vindicable, warrantable; alleged, assumed, conjectured, guessed, presumed, surmised, suspectedNear Antonyms debatable, disprovable, disputable, refutableAntonyms indemonstrable, insupportable, unprovable, unsupportable, unsustainable, unverifiable

3 capable of being endured the general didn't think that such heavy casualties could be sustainable for much longer Synonyms endurable, sufferable, supportable, bearable, tolerableRelated Words livable (also liveable), survivable; acceptable, adequate, admissible, allowable, permissible, reasonable, satisfactoryNear Antonyms agonizing, appalling, awful, bad, cruel, dire, dreadful, excruciating, frightful, ghastly, grisly, gruesome (also grewsome), harrowing, harsh, hideous, horrendous, horrible, horrid, horrifying, lurid, macabre, monstrous, nasty, nightmarish, painful, rotten, shocking, terrible, tormenting, torturous, unfortunate, vicious, vile, wretched; unacceptable; acute, extreme, intense, piercing; abhorrent, deplorable, disgusting, distasteful, loathsome, nauseating, obnoxious, offensive, repugnant, repulsive, revolting, sickening; abominable, evil, foul, heinous, noxious, odious, unspeakableAntonyms insufferable, insupportable, intolerable, unbearable, unendurable, unsupportable