Un*an"swer*a*ble*ness

from The Collaborative International Dictionary of English v.0.48

Unanswerable \Un*an"swer*a*ble\, a.
   Not answerable; irrefutable; conclusive; decisive; as, he
   gave an unanswerable argument. -- {Un*an"swer*a*ble*ness}, n.
   -- {Un*an"swer*a*bly}, adv.
   [1913 Webster]