dissonance

noun4

1. •
   A harsh, discordant combination of sounds.
2. •
   A state of disagreement or conflict.

   • Cognitive dissonance exists when a person possesses two cognitions, one of which is contradictory to the other — 1977
3. •
   An instance of that state.
4. •
   Conflicting notes that are not overtones of the note or chord sounding.