untenable
adjective formal uk/ʌnˈten.ə.bəl/ us/ʌnˈten.ə.bəl/
（理论或论点）难以捍卫的，站不住脚的
If a theory or argument is untenable, it cannot be supported or defended against criticism.
（局面）难以继续的，难维持的
An untenable situation cannot continue as it is.
If three people in four no longer support the government, isn't this an untenable situation? 如果四分之三的人不再支持政府，这样的局面就难以为继了吧？