Meanings
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1
adj
That cannot be tolerated or endured.
My Lord you do me moſt inſupportable vexation.
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2
adj
That cannot be supported; that cannot be demonstrated or proved. (of a statement, claim, argument, etc.)
[…] the energy debate is in danger of being corrupted by misstatements small and large. Among these is the insupportable proposition that the California energy crisis can somehow be relieved by drilling in the Arctic refuge — an idea Ms. Norton echoed when she said that new drilling would “resolve some of the problems we’ve been having lately.”.
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3
adj
incapable of being justified or explained
Thesaurus
Etymology
From Middle French insupportable, from Late Latin insupportabilis. See also in- + supportable.