| secure(adjective, firm, solid, stable, fixed) |
| serene(adjective, firm, solid, stable, fixed) |
| set(adjective, strong, flat, firm, solid) |
| set-up(adjective, certain, limited, inflexible, restricted) |
| set in stone(expression, adjective, idiom, firm, solid) |
| settled(adjective, strong, flat, firm, solid) |
| sheer(adjective, complete, total, definite, absolute) |
| simple(adjective, complete, total, definite, absolute) |
| sincere(adjective, complete, warm, total, passionate) |
| single-minded(adjective, firm, solid, intense, steady) |
| sober(adjective, firm, solid, stable, fixed) |
| solid(adjective, firm, certain, steady, substantial) |
| sound(adjective, firm, solid, stable, fixed) |
| specific(adjective, strong, certain, definite, resolved) |
| stable(adjective, strong, flat, firm, solid) |
| staid(adjective, firm, solid, stable, fixed) |
| stand pat(expression, adjective, strong, certain, definite) |
| stated(adjective, strong, flat, certain, determined) |
| staunch(adjective, strong, flat, firm, solid) |
| steady-going(adjective, firm, solid, substantial, stable) |