| mum(adjective, quiet, soft, low, still) |
| silent(adjective, close, quiet, soft, low) |
| whispered(quiet, soft, silent) |
| bashful(quiet, soft, still, shy, silent) |
| buttoned up(expression, adjective, close, quiet, soft) |
| checked(quiet, soft, still, silent, hushed) |
| clammed up(expression, adjective, close, quiet, soft) |
| close(quiet, soft, still, silent, hushed) |
| closed up(expression, adjective, close, quiet, soft) |
| closemouthed(quiet, soft, low, still, shy) |
| curbed(quiet, soft, still, silent, hushed) |
| dumb(quiet, soft, still, silent, hushed) |
| dummied up(expression, adjective, close, quiet, soft) |
| faint(quiet, soft, low, still, silent) |
| hush(adjective, close, quiet, soft, restrained) |
| hushed(adjective, close, quiet, soft, low) |
| iced(adjective, close, quiet, soft, restrained) |
| inarticulate(quiet, soft, still, silent, hushed) |
| inaudible(adjective, quiet, soft, low, still) |
| incoherent(quiet, soft, still, silent, hushed) |