| off |
| off-pitch(flat, discordant, screeching, tuneless) |
| offbeat(adjective, separate, distinct, different, tense) |
| omnifarious(adjective, incongruous, various, disparate, varied) |
| omniform(adjective, incongruous, various, disparate, varied) |
| on a sour note(expression, adjective, idiom, harsh, contrary) |
| open |
| opposed(adjective, hostile, distinct, different, contrary) |
| out-of-key(adjective, hard, severe, sharp, flat) |
| out-of-tune(adjective, hard, severe, sharp, flat) |
| out of accord(expression, idiom) |
| out of keeping(expression, adjective, idiom, flat, inadequate) |
| out of key(expression, adjective, idiom, discordant, screeching) |
| out of step(expression, adjective, idiom, uncertain, irregular) |
| out of tone(expression, idiom) |
| out of whack(expression, idiom) |
| paradoxical(adjective, contrary, adverse, conflicting, incompatible) |
| piercing |
| poles asunder |
| quarreling(adjective, harsh, different, antagonistic, contrary) |