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Webster 1913 Edition

Adj.

Insupportable; unendurable.

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Unˊsup-port′a-ble-ness

Noun.

Bp. Wilkins.

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Unˊsup-port′a-bly

adv.

Adj.

That cannot be supported; intolerable. [But insupportable is generally used.]

unsupportable ‎(comparative more unsupportable, superlative most unsupportable)