| hushful(adjective, close, quiet, soft, low) |
| iced(adjective, close, quiet, restrained, still) |
| inarticulate(adjective, still, faint, unclear, hushed) |
| inaudible(adjective, close, quiet, soft, low) |
| incoherent(adjective, still, faint, unclear, hushed) |
| inconversable(adjective, close, quiet, restrained, still) |
| indistinct(adjective, still, faint, unclear, hushed) |
| inhibited(adjective, still, faint, unclear, hushed) |
| inobtrusive(adjective, quiet, soft, low, silenced) |
| laconic(adjective, still, faint, unclear, hushed) |
| low(adjective, close, quiet, soft, peaceful) |
| low-pitched(adjective, close, quiet, soft, low) |
| mousy(adjective, still, faint, unclear, hushed) |
| muffled(adjective, close, quiet, soft, low) |
| mum(adjective, quiet, restrained, still, silent) |
| muted(adjective, close, quiet, soft, low) |
| noiseless(adjective, close, quiet, soft, low) |
| nonvocal(adjective, close, quiet, restrained, still) |
| not forthcoming(expression, adjective, quiet, shy, silent) |
| not saying boo(expression, adjective, idiom, close, quiet) |