| sedate(adjective, firm, solid, stable, fixed) |
| self-possessed(adjective, firm, solid, stable, fixed) |
| sensible(adjective, firm, solid, stable, fixed) |
| serene(adjective, firm, solid, stable, fixed) |
| serious-minded(adjective, firm, solid, stable, fixed) |
| set(adjective, firm, solid, stable, fixed) |
| set in stone(expression, adjective, idiom, firm, solid) |
| settled(adjective, firm, solid, stable, fixed) |
| single-minded(adjective, firm, solid, stable, fixed) |
| sober(adjective, firm, solid, stable, fixed) |
| solid(adjective, firm, substantial, stable, fixed) |
| solid as a rock(expression, adjective, idiom, firm, solid) |
| sound(adjective, firm, solid, stable, fixed) |
| staid(adjective, firm, solid, stable, fixed) |
| staunch(adjective, firm, solid, stable, fixed) |
| sturdy(adjective, firm, solid, stable, fixed) |
| substantial(adjective, firm, solid, stable, fixed) |
| sure(adjective, firm, solid, stable, fixed) |
| unbroken(adjective, steady) |
| unchangeable(adjective, firm, solid, stable, fixed) |