Indefensible
Indefensible
[Prefix in- not + defensible: compare Old French indefensible, indefensable.]
Not defensible; not capable of being defended, maintained, vindicated, or justified; unjustifiable; untenable; as, an indefensible fortress, position, cause, statement, etc.
Men find that something can be said in favor of what, on the very proposal, they thought utterly indefensible.