CLASHING

To make a clashing sound.

"The cymbals clashed."

To cause to make a clashing sound.

To come into violent conflict.

"Fans from opposing teams clashed on the streets after the game."

A clash; the sound or action of clashing; violent collision.

Conflicting, contrasting, or contrary; inconsonant, incompatible, or irreconcilable

Mismatched, inharmonious, discordant or dissonant, not fitting well together (especially in regards to aesthetics, colors, clothing, or sounds)

Adverse or antagonistic; disagreeing or opposing