Pertaining to antithesis, or opposition of words and sentiments; containing, or of the nature of, antithesis; contrasted.
adverse or antagonistic; disagreeing or opposing
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)
Producing a clash or series of clashes.
A clash; the sound or action of clashing; violent collision.