INDEFENSIBLE
Source: 566, 567
indefensible. Indefensible, a. not to be defended, infamous
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In′de‐fen″si‐ble (?), [[Pref. in- not + defensible: cf. OF. indefensible, indefensable.]] Not defensible; not capable of being defended, maintained, vindicated, or justified; unjustifiable; untenable; as, an indefensible fortress, position, cause, etc. Men find that something can be said in favor of what, on the very proposal, they thought utterly indefensible. Burke.