| mute(adjective, close, quiet, soft) |
| dumb(adjective, calm, close, quiet, beat) |
| taciturn(noun, adjective, calm, close, quiet) |
| silent(adjective, calm, close, quiet, soft) |
| quiet(adjective, close, soft, still) |
| tight-lipped(adjective, close, quiet, soft) |
| reticent(adjective, close, quiet, soft) |
| uncommunicative(adjective, close, quiet, soft) |
| reserved(adjective, close, quiet, soft) |
| close(adjective, quiet, soft, aloof) |
| noiseless(adjective, close, quiet, soft) |
| not saying boo(expression, adjective, idiom, close, quiet) |
| inaudible(adjective, close, quiet, soft, obscure) |
| soundless(adjective, close, quiet, soft) |
| still(adjective, adverb, close, quiet, soft) |
| buttoned up(expression, adjective, close, quiet, soft) |
| clammed up(expression, adjective, close, quiet, soft) |
| close-mouthed(adjective, close, quiet, soft) |
| inobtrusive(adjective, quiet, soft) |
| could hear a pin drop(expression, adjective, idiom, close, quiet) |