| smooth(adjective, calm, quiet, tranquil, silent) |
| soft(adjective, close, quiet, low, peaceful) |
| soundless(adjective, close, quiet, smooth, soft) |
| speechless(adjective, close, quiet, soft, low) |
| stable(adjective, calm, quiet, smooth, tranquil) |
| stagnant(adjective, calm, quiet, smooth, tranquil) |
| static(adjective, calm, quiet, smooth, tranquil) |
| stationary(adjective, calm, quiet, smooth, tranquil) |
| still(adjective, calm, close, quiet, soft) |
| stilled(adjective, close, quiet, soft, low) |
| stock-still(adjective, calm, quiet, smooth, tranquil) |
| taciturn(adjective, close, quiet, soft, low) |
| tight-lipped(adjective, close, quiet, soft, low) |
| tranquil(adjective, calm, quiet, smooth, gentle) |
| uncommunicative(adjective, close, quiet, soft, low) |
| undisturbed(adjective, calm, quiet, smooth, tranquil) |
| unexpressed(adjective, close, quiet, soft, low) |
| unruffled(adjective, calm, quiet, smooth, tranquil) |
| unspeaking(adjective, close, quiet, soft, low) |
| unstirring(adjective, calm, quiet, smooth, tranquil) |