| sturdy(adjective, firm, solid, determined, stable) |
| undaunted(adjective, bold, brave) |
| unqualified(adjective, complete, firm, total, solid) |
| unquestioning(adjective, set, clear, warm, firm) |
| unshaken(adjective, set, clear, strong, firm) |
| wholehearted(adjective, complete, firm, total, solid) |
| adamant(adjective, strong, firm, intense, determined) |
| certain(adjective, set, clear, complete, firm) |
| deliberate(adjective, firm, intense, determined, resolute) |
| dependable(adjective, firm, solid, determined, stable) |
| immutable |
| indomitable(adjective, strong, firm, determined, steady) |
| lasting(adjective, persevering) |
| patient(adjective, strong, firm, energetic, determined) |
| perseverant |
| positive(adjective, clear, complete, total, intense) |
| relentless(adjective, strong, firm, energetic, vigorous) |
| stable(adjective, firm, solid, steady, regular) |
| undoubting(adjective, big, limited, sure, implicit) |
| unrelenting(adjective, perseverance) |