Source : Webster's Revised Unabridged Dictionary (1913)

Inharmonious \In`har*mo"ni*ous\, a. [Pref. in- not + harmonious:
   cf. F. inharmonieux.]
   1. Not harmonious; unmusical; discordant; dissonant.

            Sounds inharmonious in themselves and harsh.
                                                  --Cowper.

   2. Conflicting; jarring; not in harmony.

Source : WordNet®

inharmonious
     adj 1: not in harmony [syn: {unharmonious}] [ant: {harmonious}]
     2: lacking in harmony of parts; "an inharmonious (or
        incongruous) mixture of architectural styles"