clashing

1. To make a clashing sound.

   The cymbals clashed.

2. To cause to make a clashing sound.
3. To come into violent conflict.

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

4. To argue angrily.
5. (in games or sports) To face each other in an important game.
6. (of clothes, decor, colours) To fail to look good together; to contrast unattractively; to fail to harmonize.

   The hotel room was ugly, and the wallpaper clashed with the carpet.

7. (of events) To coincide, to happen at the same time, thereby rendering it impossible to attend all.

   I can't come to your wedding because it clashes with a friend's funeral.

8. To chatter or gossip.

noun

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

1. Conflicting, contrasting, or contrary; inconsonant, incompatible, or irreconcilable
2. Mismatched, inharmonious, discordant or dissonant, not fitting well together (especially in regards to aesthetics, colors, clothing, or sounds)
3. Adverse or antagonistic; disagreeing or opposing