| inconsonant(adjective, harsh, rude, contrary, discordant) |
| irregular(flat, discordant, dissonant, screeching, tuneless) |
| jagged(adjective, hard, severe, sharp, flat) |
| lacking melody(expression, idiom) |
| musicless |
| nonmelodious |
| not harmonious(expression, idiom, flat, discordant, dissonant) |
| not smooth(expression, adjective, hard, severe, sharp) |
| noteless |
| off |
| off-pitch(flat, discordant, dissonant, screeching, tuneless) |
| on a sour note(expression, adjective, harsh, rude, contrary) |
| out-of-key(adjective, hard, severe, sharp, flat) |
| out-of-tune(adjective, hard, severe, sharp, flat) |
| out of keeping(expression, idiom, flat, discordant, dissonant) |
| out of tone(expression, idiom) |
| raging(adjective, rough, harsh, dirty, coarse) |
| rigid(adjective, hard, severe, sharp, flat) |
| rugged(adjective, hard, severe, sharp, rough) |
| rusty(adjective, hard, severe, sharp, flat) |