| close-mouthed(adjective, close, quiet, soft, low) |
| contrabass |
| could hear a pin drop(expression, adjective, idiom, close, quiet) |
| delicate(adjective, calm, dull, weak, soft) |
| double-bass |
| dumb(adjective, close, quiet, soft, low) |
| feeble(adjective, calm, dull, weak, soft) |
| heavy |
| hollow |
| hushed(adjective, calm, dull, close, quiet) |
| hushful(adjective, close, quiet, soft, low) |
| imperceptible(adjective, calm, dull, weak, soft) |
| inaudible(adjective, dull, close, quiet, weak) |
| inclined |
| inobtrusive(adjective, quiet, soft, low) |
| lenient(adjective, calm, dull, weak, soft) |
| light(adjective, calm, dull, weak, soft) |
| low-key(adjective, subdued, understated, unglamorous, unspectacular) |
| low-toned(adjective, calm, strong, hard, moderate) |
| mild(adjective, calm, dull, quiet, weak) |