| unshakable |
| untiring(adjective, determined, persevering) |
| adamant(adjective, strong, flat, firm, harsh) |
| audacious(adjective, courage) |
| decisive(adjective, determined, serious, resolute, persistent) |
| definite(adjective, strong, flat, firm, certain) |
| dependable(adjective, resolute, persistent, dedicated, unwavering) |
| diligent(adjective, resolute) |
| gallant(adjective, ready, determined, bold, wise) |
| immovable(adjective, determined, fixed, resolute, persistent) |
| immutable |
| intent(adjective, strong, flat, certain, determined) |
| intractable(adjective, cruel, determined, fixed, resolute) |
| ruthless(adjective, mean, strong, severe, harsh) |
| stern(adjective, resolute, persistent, obstinate, insistent) |
| strong-minded(adjective, determined, resolution, fixed, serious) |
| strong-willed(adjective, strong, firm, resolution, serious) |
| tough(adjective, resolute, purpose) |
| unabashed(adjective, courage) |
| unafraid(adjective, smart, ready, determined, bold) |