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English definition of “untenable”

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untenable

adjective uk   /ʌnˈten.ə.bl̩/ formal us  
If a theory or argument is untenable, it cannot be supported or defended against criticism. An untenable situation cannot continue as it is: If three people in four no longer support the government, isn't this an untenable situation?
(Definition of untenable from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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