| deadening |
| dimmed(verb, adjective, quiet, faint, melodious) |
| dumbed |
| dusky(adjective, dull, quiet, soft, obscure) |
| feeble(adjective, calm, dull, quiet, weak) |
| gradual(adjective, calm, quiet, smooth, soft) |
| hazy(adjective, dull, quiet, weak, soft) |
| hollow(adjective, deep, resonant) |
| inconspicuous(adjective, quiet, plain, hidden, imperceptible) |
| jejune(adjective, dull, weak, dead, tedious) |
| lateral |
| lusterless(adjective, dull, flat, boring, lifeless) |
| mild(adjective, calm, dull, quiet, weak) |
| moderate(adjective, calm, dull, quiet, weak) |
| moderated(verb, quiet, gentle, restrained) |
| mum(adjective, quiet, soft, low, still) |
| neutral(adjective, quiet, light, soft, gentle) |
| obtuse |
| open |
| pale(adjective, dull, quiet, light, weak) |