INDEFENSIBLE n.
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.
JUSTIFY v.
To prove or show to be just; to vindicate; to maintain or defend as conformable to law, right, justice, propriety, or duty. That to the height of this great argument I may assert eternal providence, And justify the ways of God to men. Milton. Unless the oppression is so extreme as to justify revolution, it would not ju…