| quiet(adjective, dull, close, weak, soft) |
| imperceptible(adjective, dull, quiet, hard, weak) |
| hushed(adjective, dull, close, quiet, weak) |
| indistinct(adjective, dull, quiet, weak, soft) |
| low(adjective, dull, close, quiet, weak) |
| soft(adjective, dull, close, quiet, weak) |
| muffled(adjective, dull, close, quiet, weak) |
| muted(adjective, dull, close, quiet, weak) |
| weak(adjective, dull, soft, gentle, low) |
| dull(adjective, quiet, weak, soft, gentle) |
| stifled(adjective, dull, quiet, weak, soft) |
| bated(adjective, dull, weak, soft, gentle) |
| distant(adjective, dull, weak, soft, gentle) |
| low-pitched(adjective, dull, close, quiet, weak) |
| pale(adjective, dull, weak, soft, gentle) |
| whispered(adjective, dull, weak, soft, gentle) |
| unaccented(adjective, dull, soft, low) |
| unstressed(adjective, dull, soft, low) |
| reedy(adjective, dull, soft, low) |