| mute(adjective, close, quiet, soft, low) |
| quiet(adjective, close, sound, soft, low) |
| taciturn(noun, adjective, calm, close, quiet) |
| still(adjective, adverb, calm, close, quiet) |
| mum(adjective, close, quiet, soft, low) |
| soundless(adjective, close, quiet, sound, smooth) |
| noiseless(adjective, close, quiet, sound, smooth) |
| reserved(adjective, close, quiet, soft, low) |
| reticent(adjective, close, quiet, soft, low) |
| hushed(adjective, close, quiet, sound, smooth) |
| tacit(adjective, speech, taken, implicit, nameless) |
| voiceless(adjective, quiet, low, speech, dumb) |
| dumb(adjective, calm, close, quiet, soft) |
| uncommunicative(adjective, close, quiet, soft, low) |
| close-mouthed(adjective, close, quiet, smooth, soft) |
| speechless(adjective, calm, close, quiet, soft) |
| wordless(adjective, calm, quiet, soft, low) |
| tight-lipped(adjective, close, quiet, soft, low) |
| calm(adjective, quiet, sound, smooth, gentle) |
| inarticulate(adjective, calm, quiet, humble, unable) |