| buttoned up(expression, adjective, close, quiet, soft) |
| clammed up(expression, adjective, close, quiet, soft) |
| hushed(adjective, close, quiet, soft, low) |
| inaudible(adjective, close, quiet, soft, low) |
| inobtrusive(adjective, quiet, soft, low, silenced) |
| low(adjective, close, quiet, soft, peaceful) |
| low-pitched(adjective, close, quiet, soft, low) |
| muffled(adjective, close, quiet, soft, low) |
| mute(adjective, close, quiet, soft, low) |
| muted(adjective, close, quiet, soft, low) |
| noiseless(adjective, close, quiet, soft, low) |
| not saying boo(expression, adjective, idiom, close, quiet) |
| quiescent(adjective, close, quiet, soft, low) |
| quiet(adjective, close, soft, low, silent) |
| quieted(adjective, close, quiet, soft, low) |
| reserved(adjective, close, quiet, soft, low) |
| reticent(adjective, close, quiet, soft, low) |
| secretive(adjective, close, quiet, soft, low) |
| silent(adjective, close, quiet, soft, low) |
| soft(adjective, close, quiet, low, peaceful) |