Source : Webster's Revised Unabridged Dictionary (1913)

Disharmony \Dis*har"mo*ny\, n.
   Want of harmony; discord; incongruity. [R.]

         A disharmony in the different impulses that constitute
         it [our nature].                         --Coleridge.

Source : WordNet®

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