Definition of "unsupportably" [unsupportably]

• In an unsupportable manner (adverb)

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• "Sorry, your argument on this point is still looking unsupportably silly."
• "By "unsupportably high cost of housing", I mean that the propeties themselves do not always support the high costs."
• "That plus the unsupportably high cost of housing in our district causes folks to get in way over their heads."