| tongue-tied(adjective, quiet, awkward, still) |
| quiet(adjective, soft, low, silent) |
| reserved(adjective, quiet, still, silent) |
| muted(quiet, soft, low, still) |
| soundless(quiet, soft, low, still) |
| bashful(quiet, awkward, still, silent) |
| buttoned up(expression, quiet, still, silent) |
| clammed up(expression, quiet, still, silent) |
| closemouthed(quiet, soft, low, still) |
| hushed(quiet, soft, low, still) |
| nonvocal(quiet, soft, low, still) |
| not talkative(expression, quiet, low, silent) |
| tight-lipped(adjective, quiet, silent, dazed) |
| unsociable(quiet, still, silent, hushed) |
| unspeaking(quiet, still, silent, hushed) |
| zipped(quiet, still, silent, hushed) |
| not forthcoming(expression, quiet, silent, tight-lipped) |
| secretive(quiet, silent, tight-lipped) |