Irre*fran"gi*ble*ness

from The Collaborative International Dictionary of English v.0.48

Irrefrangible \Ir`re*fran"gi*ble\, a.
   Not refrangible; that can not be refracted in passing from
   one medium to another. -- {Ir`re*fran"gi*ble*ness}, n.
   [1913 Webster]