| silent(adjective, close, quiet, soft, still) |
| bashful(quiet, soft, still, silent, hushed) |
| buttoned up(verb, expression, adjective, phrasal verb, close) |
| checked(quiet, soft, still, faint, unclear) |
| clammed up(verb, expression, adjective, close, quiet) |
| close(quiet, soft, still, silent, hushed) |
| closemouthed(quiet, soft, still, silent, hushed) |
| curbed(quiet, soft, still, faint, unclear) |
| dumb(quiet, soft, still, silent, quieten) |
| dummied up(verb, expression, adjective, close, quiet) |
| faint(quiet, soft, still, unclear, silent) |
| hush(verb, adjective, close, quiet, soft) |
| hushed(adjective, close, quiet, soft, restrained) |
| iced(adjective, close, quiet, soft, restrained) |
| inarticulate(quiet, soft, still, faint, unclear) |
| incoherent(quiet, soft, still, faint, unclear) |
| inconversable(adjective, close, quiet, soft, restrained) |
| indistinct(quiet, soft, still, faint, unclear) |
| inhibited(quiet, soft, still, faint, unclear) |
| laconic(quiet, soft, still, faint, unclear) |