Antonyms of adj unsupportable

1 sense of unsupportable

Sense 1
unsupportable -- (not able to be supported or defended)

INDIRECT (VIA intolerable) -> tolerable -- (capable of being borne or endured; "the climate is at least tolerable")

Similarity of adj unsupportable

1 sense of unsupportable

Sense 1
unsupportable -- (not able to be supported or defended)
       => intolerable (vs. tolerable), unbearable, unendurable -- (incapable of being put up with; "an intolerable degree of sentimentality")