| quiet knocking(expression, quality, silence, noise) |
| quiet sound(expression, quality, silence, noise) |
| low noise(expression, quality, silence, noise) |
| susurration(noun, quality, silence, noise) |
| faint knock(expression, quality, silence, noise) |
| quiet voice(expression, quality, silence, noise) |
| low(noun, verb, adjective, adverb, quality) |
| quiet creak(expression, quality, silence, noise) |
| weak voice(expression, quality, silence, noise) |
| whispering(noun, verb, quality, silence, voice) |
| muffled(verb, adjective, quality, silence, noise) |
| muffled noise(expression, quality, silence, noise) |
| muffled sound(expression, quality, silence, noise) |
| muted(verb, adjective, quality, silence, noise) |
| quiet whistle(expression, quality, silence, noise) |
| soft sound(expression, quality, silence, noise) |
| whisper(noun, verb, quality, silence, voice) |
| black |
| low voice(expression, quality, silence, noise) |
| quiet ringing(expression, quality, silence, noise) |