| muffled(verb, adjective, dull, close, quiet) |
| subdued(verb, adjective, calm, dull, close) |
| hushed(verb, adjective, calm, dull, close) |
| quiet(adjective, calm, dull, close, weak) |
| soft(adjective, calm, dull, close, quiet) |
| dull(adjective, quiet, weak, simple, soft) |
| low(adjective, calm, dull, close, quiet) |
| faint(adjective, calm, close, quiet, weak) |
| softened(verb, adjective, dull, quiet, weak) |
| deadened(verb, adjective, quiet, weak, pale) |
| dim(adjective, dull, quiet, weak, soft) |
| stifled(verb, adjective, quiet, weak, pale) |
| indistinct(adjective, dull, close, quiet, weak) |
| silent(adjective, close, quiet, soft, low) |
| weak(adjective, dull, soft, gentle, dark) |
| delicate(adjective, calm, dull, quiet, light) |
| noiseless(adjective, close, quiet, soft, low) |
| flat(adjective, dull, quiet, soft, obscure) |
| inaudible(adjective, dull, close, quiet, weak) |
| mellow(adjective, calm, quiet, smooth, soft) |