a. [ Cf. F. défensable, LL. defensabilis, defensibilis. See Defense, and cf. Defendable. ]
n. Capability of being defended; defensibility. Priestley. [ 1913 Webster ]
[ Pref. in- not + defensible: cf. OF. indefensible, indefensable. ] Not defensible; not capable of being defended, maintained, vindicated, or justified; unjustifiable; untenable;
Men find that something can be said in favor of what, on the very proposal, they thought utterly indefensible. Burke. [ 1913 Webster ]