Source : Webster's Revised Unabridged Dictionary (1913)

Inharmoniousness \In`har*mo"ni*ous*ness\, n.
   The quality of being inharmonious; want of harmony; discord.

         The inharmoniousness of a verse.         --A. Tucker.

Source : WordNet®

inharmoniousness
     n : a lack of harmony [syn: {disharmony}]