adj. 25B6; adjective INDEFENSIBLE, undefendable, insupportable, unsustainable, unjustified, unjustifiable, flimsy, weak, shaky.
UNTENABLE
Meaning of UNTENABLE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012