| steadfast(adjective, determined, usual, unreasonable, regular) |
| steely(adjective, strong, hard, tough, determined) |
| strait-laced(adjective, severe) |
| strict(adjective, strong, hard, tough, severe) |
| strong-willed(adjective, determined, resolute, uncompromising, unshakeable) |
| stuffy |
| uncooperative(adjective, mean, hard, tough, harsh) |
| unswerving(adjective, determined, resolute, uncompromising, unshakeable) |
| unwavering(adjective, determined, resolute, persistent, constant) |
| wilful(adjective, determined, resolute, uncompromising, unshakeable) |
| astringent(adjective, strong, hard, tough, severe) |
| authoritarian(adjective, strong, hard, tough, severe) |
| balky(adjective, tough, firm, unreasonable, grim) |
| conservative |
| contumacious(adjective, tough, firm, determined, unreasonable) |
| conventional(adjective, usual, customary, established, traditional) |
| dour(adjective, severe) |
| hanging tough(expression, adjective, mean, hard, determined) |
| hard-headed(adjective, persistent, constant, pitiless, unyielding) |
| hardened(adjective, determined, resolute, uncompromising, unshakeable) |