| voiceless(adjective, quiet, soft, low, still) |
| wordless(adjective, quiet, soft, low, still) |
| damped |
| dampened |
| deadened |
| indistinct(adjective, close, quiet, soft, gentle) |
| mousy(quiet, soft, still, silent, hushed) |
| pacific(adjective, calm, quiet, smooth, tranquil) |
| placid(adjective, calm, quiet, smooth, tranquil) |
| quiescent(adjective, close, quiet, soft, low) |
| restful(adjective, calm, quiet, smooth, tranquil) |
| unhearable(quiet, soft, low) |
| unheard(adjective, still, silent, hushed, soundless) |
| unruffled(adjective, calm, quiet, smooth, tranquil) |
| unuttered(adjective, close, quiet, soft, low) |
| unvoiced |
| whist(adjective, close, quiet, smooth, soft) |
| at rest(expression, adjective, calm, quiet, smooth) |
| bashful(quiet, soft, still, silent, hushed) |
| buttoned up(expression, adjective, close, quiet, smooth) |