A lack of harmony or agreement among elements; discord, dissonance, or incongruity (applies to relationships, colors, music, etc.).
昨夜の会議では意見の不調和が目立ち、結論が出なかった。
At last night's meeting, discord among opinions was noticeable, and no conclusion was reached.
部屋の家具の色が不調和で落ち着かない。
The colors of the furniture in the room are incongruous, so it doesn't feel calm.
この曲にはあえて不調和な和音を使っている。
This piece deliberately uses dissonant chords.