Indefensible
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Not defensible; not capable of being defended, maintained,vindicated, or justified; unjustifiable; untenable; as, anindefensible fortress, position, cause, etc.Men find that something can be said in favor of what, on the veryproposal, they thought utterly indefensible. Burke.
Indefensible meaning & definition 1 of Indefensible.