| voiceless(adjective, quiet, awkward, silent) |
| tight-lipped(adjective, quiet, reticent, silent) |
| reserved(quiet, still, reticent, silent) |
| closemouthed(quiet, still, reticent, silent) |
| quiet(still, reticent, silent, uncommunicative) |
| bashful(adjective, quiet, awkward, still) |
| buttoned up(expression, quiet, still, reticent) |
| clammed up(expression, quiet, still, reticent) |
| hushed(quiet, still, reticent, silent) |
| muted(quiet, still, reticent, silent) |
| nonvocal(quiet, still, silent, hushed) |
| not forthcoming(expression, quiet, silent, tight-lipped) |
| not talkative(expression, quiet, still, reticent) |
| secretive(quiet, reticent, silent, uncommunicative) |
| soundless(quiet, still, silent, hushed) |
| uncommunicative(adjective, quiet, awkward, reticent) |
| unsociable(quiet, still, silent, hushed) |
| unspeaking(quiet, still, silent, hushed) |
| zipped(quiet, still, reticent, silent) |