| blurred(adjective, dull, weak, soft, gentle) |
| bottled up(expression, calm, quiet, reasonable, mild) |
| breakable(gentle, mild, subtle) |
| broad |
| buttoned up(expression, adjective, close, quiet, soft) |
| cacuminal |
| caliginous(adjective, dull, dark, gloomy, faint) |
| calm and collected(expression, calm, quiet, reasonable, mild) |
| central |
| cerebral |
| chilled(calm, quiet, reasonable, mild, controlled) |
| choice(gentle, mild, subtle) |
| clammed up(expression, adjective, close, quiet, soft) |
| close-mouthed(adjective, close, quiet, soft, low) |
| closed up(expression, quiet, soft, still, silent) |
| closemouthed(quiet, soft, low, shy, reticent) |
| cloudy(adjective, dull, soft, obscure, flat) |
| cold(adjective, soft, severe, obscure, flat) |
| colorless(adjective, dull, weak, soft, obscure) |
| consonant |