The Collaborative International Dictionary
Intenable
Intenable \In*ten"a*ble\, a. [Pref. in- not + tenable: cf. F.
intenable.]
Incapable of being held; untenable; not defensible; as, an
intenable opinion; an intenable fortress. [Obs.]
--Bp.
Warburton.
Wiktionary
intenable
a. (context obsolete English) untenable. (18th c.)