Being such that defense or maintenance is impossible: an untenable position. (adjective)
Being such that occupation or habitation is impossible: untenable quarters. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "untenable" in a sentence
"Moosa, on Wednesday to intervene in what it called the untenable situation of South Africa's conservation sector."
"His plan to offer up the goddess Freia to the giants who built Valhalla is untenable from the start, as it would mean forcing the Gods to give up their eternal youth (her golden apples do a lot more than just keep the doctor away -- and remember, there was no Botox in 19th century Germany)."
"There are many innocent victims but also many many people that put themselves in untenable positions with purchases that they could barely afford and too little savings to weather a storm."