Indefensible /(?)/
In·de·fen·si·ble
Indefensible
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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.