| rooted(adjective, secure, determined, usual, steady) |
| ruthless(adjective, harsh, cruel, determined, fierce) |
| scheduled(adjective, firm, determined, usual, regular) |
| sedulous |
| self-willed(adjective, determined, fixed, stubborn, willful) |
| settled(adjective, strong, flat, firm, intense) |
| solid |
| solid as a rock(expression, adjective, idiom, firm, determined) |
| specified(adjective, firm, determined, usual, regular) |
| stalwart(adjective, strong, intense, deliberate, determined) |
| stand pat(expression, adjective, definite, fixed, impassive) |
| stated(adjective, strong, flat, certain, determined) |
| staunch(adjective, strong, intense, deliberate, determined) |
| steady(adjective, strong, firm, solid, intense) |
| stiff(adjective, severe, harsh, cruel, determined) |
| stiff-necked(adjective, set, determined, usual, regular) |
| stipulated(adjective, strong, flat, certain, determined) |
| stop at nothing(expression, adjective, idiom, harsh, energetic) |
| strenuous |
| strict(adjective, strong, severe, flat, harsh) |