1. disagreement, dissension, dissonance -- (a conflict of people's opinions or actions or characters)
2. noise, dissonance, racket -- (the auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience; "modern music is just noise to me")
3. dissonance -- (disagreeable sounds)
1.
There already existed between them all the dissonances of the grave young man and the frivolous old man. - from Les Miserables by Victor Hugo