Adjective : It was unpleasant to spend an evening with such an inharmonious group.    From Dictionary.com. 

For all that, she had the same incompleteness that she had when I last saw her, and an inharmoniousness that was felt by the hearer whenever she spoke.    From Wordnik.com.  [The Atlantic Monthly, Volume 12, No. 72, October, 1863] Reference

To be sure, inharmoniousness of contrast was beginning to be a little subdued by the dirt and grease of the wearer's own laying on, the coat being no longer glossy and sky-blue, the shirt no longer starchy and snow-white.    From Wordnik.com.  [Burl] Reference