Untenable means that something is not possible or not likely to happen. The situation is untenable because it's not possible for the government to pay its debts
The government's debt is untenable and it will soon be unable to pay its bills.
The proposal is untenable because it will not solve the problem.
adjective
(of theories etc) incapable of being defended or justified
Synonyms:
1
The present situation is untenable.
2
That is untenable in a reliable survey of the topic.
3
The article is pretentious and scientifically untenable.
4
Agree with the above that the current situation is untenable.
5
The College position is that it is untenable to recommend the procedure.
6
All of the evidence used to support the proposition is untenable.
7
In so doing, they made the defence of the city untenable.
8
However, the success was fleeting as the position proved untenable.
9
For a chess player, the content of the article is clearly untenable.
10
After remove the second choice, the paragraph seemed untenable.