| overzealous |
| prearranged(adjective, firm, determined, usual, regular) |
| predetermined(adjective, firm, determined, usual, regular) |
| prescribed(adjective, firm, determined, usual, regular) |
| regular(adjective, firm, determined, usual, planned) |
| rigorous(adjective, obstinate, stubborn, unbending) |
| rooted(adjective, firm, determined, usual, regular) |
| scheduled(adjective, firm, determined, usual, regular) |
| settled(adjective, firm, determined, usual, regular) |
| solid as a rock(expression, adjective, idiom, firm, determined) |
| specified(adjective, firm, determined, usual, regular) |
| stated(adjective, firm, determined, usual, regular) |
| staunch(firm, determined, resolute, obstinate, stubborn) |
| steady |
| steely(adjective, obstinate, stubborn, unbending) |
| stern(adjective, determined, resolute, uncompromising, unshakeable) |
| stiff necked(expression, idiom) |
| stipulated(adjective, firm, determined, usual, regular) |
| stony |
| strong-minded(determined, fixed, impulsive, stubborn, reckless) |