UNTENABLE

[adjective] [formal] - (esp. of a theory or argument) not able to be supported or defended against criticism, or (of a situation) no longer able to continueThe government's science budget has forced deep cuts in research and is politically untenable.The cliffs are collapsing into the sea and living in the cottages at the cliff edge is now untenable.If three people in four no longer support the government, isn't this an untenable situation?