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: too unpleasant, painful, or difficult to accept or endure : not endurable : unbearable
unendurable suffering … periods of unendurable stress and desperation.— Oliver Sacks
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insufferable, insupportable, intolerable, unbearable, unsupportable
endurable, sufferable, supportable, sustainable, tolerable
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1801, in the meaning defined above
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a private place of worship
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