inerrableness

from The Collaborative International Dictionary of English v.0.48

Inerrableness \In*er"ra*ble*ness\
   ([i^]n*[e^]r"r[.a]*b'l*n[e^]s), n.
   Exemption from error; inerrability; infallibility. --Hammond.
   [1913 Webster]