| certain(adjective, set, clear, firm, solid) |
| changeless(adjective, clear, firm, solid, certain) |
| clear(adjective, set, firm, certain, definite) |
| deliberate(adjective, firm, intense, determined, resolute) |
| exact(adjective, close, strong, correct, flat) |
| flat(adjective, strong, direct, smooth, right) |
| grim(adjective, determined, resolute, uncompromising, unshakeable) |
| implacable(adjective, determined, resolute, uncompromising, unshakeable) |
| industrious |
| intrepid |
| invariant(adjective, even) |
| level(adjective, direct, smooth, right, flat) |
| never-failing(adjective, strong, flat, firm, total) |
| plucky(adjective, resolute) |
| resistant(adjective, firm, determined, resolute, obstinate) |
| sedulous |
| steely(adjective, determined, resolute, uncompromising, unshakeable) |
| strong-minded(adjective, firm, determined, serious, resolute) |
| unflappable(adjective, consistent, unchanging) |
| valiant(adjective, resolute) |