| planate(adjective, quiet, soft, gentle, flat) |
| plane(adjective, quiet, soft, gentle, flat) |
| quiet(adjective, soft, gentle, flat, level) |
| regular(adjective, quiet, soft, gentle, flat) |
| resistance |
| rhythmic(adjective, quiet, soft, gentle, flat) |
| rippleless(adjective, quiet, soft, gentle, flat) |
| satin-smooth(adjective, smooth) |
| satiny(adjective, smooth) |
| serene(adjective, quiet, soft, gentle, flat) |
| shaven(adjective, quiet, soft, gentle, flat) |
| slick(adjective, smooth) |
| slilken(adjective, smooth) |
| slithery(adjective, smooth) |
| smooth-running |
| soft(adjective, quiet, gentle, flat, level) |
| soothing(adjective, quiet, soft, gentle, flat) |
| stable(adjective, quiet, soft, gentle, flat) |
| steady(adjective, quiet, soft, gentle, flat) |
| still(adjective, quiet, soft, gentle, flat) |