| scaly |
| scratching |
| screeching(adjective, hard, severe, sharp, flat) |
| scurfy |
| severe(adjective, hard, sharp, flat, rough) |
| sour note(expression, flat, discordant, dissonant, screeching) |
| squally(adjective, rough, harsh, dirty, coarse) |
| stertorous(rough, harsh, wild, loud, noisy) |
| stridulant(adjective, harsh, loud, asperous, grating) |
| stridulent(adjective, rough, harsh, dirty, coarse) |
| stridulous(adjective, hard, severe, sharp, flat) |
| tempestuous(adjective, rough, harsh, dirty, coarse) |
| toneless |
| turbulent(adjective, rough, harsh, wild, dirty) |
| uncongenial(adjective, inharmonious) |
| uneven(adjective, hard, severe, sharp, flat) |
| unlevel(adjective, hard, severe, sharp, flat) |
| unmixable(adjective, harsh, rude, contrary, discordant) |
| unnatural(flat, discordant, dissonant, screeching, tuneless) |
| unrelenting(adjective, hard, severe, sharp, flat) |