| uncompromising(adjective, determined, resolute, unshakeable) |
| unfailing(adjective, set, strong, firm, determined) |
| unrelenting(adjective, determined, resolute, perseverance, uncompromising) |
| even(adjective, smooth, right, firm, solid) |
| obstinate |
| pertinacious(adjective, strong, tough, firm, determined) |
| relentless(adjective, strong, tough, firm, intense) |
| reliable(adjective, close, correct, firm, honest) |
| resolved(adjective, determined, resolute, uncompromising, unshakeable) |
| stable(adjective, firm, solid, fixed, resolute) |
| stalwart |
| strict(adjective, close, correct, honest, pure) |
| undistorted(adjective, close, smooth, correct, solid) |
| adamant(adjective, strong, tough, firm, determined) |
| allegiant(adjective, close, correct, firm, honest) |
| ardent(adjective, close, correct, firm, honest) |
| brave |
| consistent(adjective, firm, solid, intense, steady) |
| fixed(adjective, complete, firm, total, solid) |
| inexorable(adjective, intense, determined, resolute, persistent) |