Source : Webster's Revised Unabridged Dictionary (1913)

Inharmonic \In`har*mon"ic\, Inharmonical \In`har*mon"ic*al\, a.
   Not harmonic; inharmonious; discordant; dissonant.

Source : WordNet®

inharmonic
     adj : lacking in harmony [syn: {discordant}, {disharmonious}, {dissonant}]