| resolute(adjective, calm, strong, secure, firm) |
| rough(adjective, severe, stiff, rigid, tight) |
| safe(adjective, calm, strong, secure, firm) |
| secure(adjective, calm, strong, firm, solid) |
| set(adjective, calm, strong, secure, severe) |
| set in stone(expression, adjective, idiom, calm, strong) |
| single-minded(adjective, firm, solid, determined, steady) |
| solid(adjective, calm, strong, firm, fast) |
| solid as a rock(expression, adjective, idiom, calm, strong) |
| sound(adjective, calm, strong, secure, firm) |
| stabile(adjective, calm, strong, secure, firm) |
| stable(adjective, firm, solid, steady, fixed) |
| stalwart(adjective, calm, strong, solid, steady) |
| stationary(adjective, calm, strong, solid, steady) |
| staunch(adjective, calm, strong, secure, firm) |
| staying put(expression, adjective, calm, strong, substantial) |
| steadfast(adjective, calm, strong, secure, firm) |
| steady(adjective, calm, strong, secure, firm) |
| stiff(adjective, severe, constant, rigid, tight) |
| stout(adjective, calm, strong, solid, steady) |