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.
Serving to hinder or oppose; adverse, disadvantageous, inconducive, unsuitable.
Of wind or weather: causing delay or obstacles; not conducive to travel or work; inclement.
Of a belief, state of mind, etc.: not favourable; disapproving.
Not auspicious; ill-boding.