| calm(verb, adjective, dull, quiet, silence) |
| check(verb, dull, quiet, reduce, restrain) |
| deaf-mute |
| inaudible(adjective, close, quiet, soft, obscure) |
| muffled(adjective, dull, close, quiet, soft) |
| reduce(verb, dull, quiet, diminish, lower) |
| reticent(adjective, close, quiet, soft, low) |
| shush(verb, calm, dull, quiet, suppress) |
| temper(verb, increase, restrain, curb, suppress) |
| turn down(verb, expression, phrasal verb, lower, subdue) |
| unexpressed(adjective, close, quiet, soft, low) |
| aphasic(adjective, speak, silent, voiceless) |
| consonant |
| damper(noun, kickback) |
| deadened(adjective, quiet, stifled, non-resonant) |
| extra |
| hushed(adjective, close, quiet, soft, low) |
| play down(verb, expression, phrasal verb, pretend, minimize) |
| repress(dull, quiet, restrain, diminish, curb) |
| support |