| round(verb, clear, press, level, flush) |
| sedate(adjective, calm, quiet, easy, firm) |
| self-possessed(adjective, calm, quiet, firm, solid) |
| slick(verb, adjective, clear, press, smooth) |
| sober(adjective, calm, quiet, reasonable, moderate) |
| soft(adjective, calm, quiet, reasonable, moderate) |
| staid(adjective, firm, solid, stable, fixed) |
| standard |
| straighten out(verb, fix, smooth, level, straight) |
| streamlined(adjective, smooth) |
| sustained(adjective, persistent, continuous, endless, relentless) |
| symmetrize(verb, smooth, match, balance, flatten) |
| unceasing(adjective, persistent, continuous, endless, relentless) |
| undiversified(adjective, rigid, inflexible, reliable, consistent) |
| unremitting(verb, adjective, sound, steady, regular) |
| unswerving(adjective, smooth, right, firm, solid) |
| unwavering(adjective, calm, strong, secure, smooth) |
| upright(adjective, smooth, honest, solid, level) |
| velvety(adjective, quiet, smooth, soft, gentle) |
| vesper(noun, start, evening, archaism) |