Fromunspeakable +‎-ness.

unspeakableness (uncountable)

1. Thecondition orquality of beingunspeakable.
   • 2007 January 27, Paul Berton, “How do we define gruesome? (editorial)”, inLondon Free Press, Canada:

     Obviously, it's theunspeakableness, the sheer horror of it, that is motivating some news organizations.

• Oxford English Dictionary, 2nd ed., 1989.See "unspeakable."

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