| unwavering(adjective, feature, state, characteristic, strong) |
| resolute(adjective, strong, firm, solid, intense) |
| steadfast(adjective, complete, firm, total, solid) |
| firm(noun, adjective, strong, complete, total) |
| steady(adjective, strong, complete, firm, total) |
| persistent(adjective, strong, firm, intense, deliberate) |
| unflagging(adjective, strong, firm, solid, energetic) |
| determined(adjective, strong, complete, warm, firm) |
| unswerving(adjective, strong, firm, total, solid) |
| persevering(adjective, strong, firm, determined, steady) |
| constant(adjective, strong, firm, solid, certain) |
| tireless(adjective, strong, firm, energetic, determined) |
| untiring(adjective, determined, steadfast, persevering) |
| indefatigable(adjective, strong, firm, determined, steady) |
| tenacious(adjective, strong, firm, intense, deliberate) |
| staunch(adjective, strong, firm, solid, intense) |
| unfailing(adjective, set, clear, strong, firm) |
| unflinching(adjective, strong, firm, certain, determined) |
| dogged(adjective, strong, firm, solid, energetic) |
| unhesitating(adjective, firm, big, limited, serious) |