| stubborn(adjective, characteristic, quality, determined, stubbornness) |
| determined(verb, adjective, strong, tough, firm) |
| tenacious(adjective, strong, tough, firm, resist) |
| persistent(adjective, strong, tough, firm, energetic) |
| obstinate(adjective, mean, strong, hard, tough) |
| obdurate(adjective, strong, tough, firm, harsh) |
| pertinacious(adjective, strong, tough, firm, energetic) |
| resolute(adjective, appearance, strong, tough, firm) |
| unyielding(adjective, appearance, mean, strong, hard) |
| firm(adjective, mean, strong, hard, tough) |
| steadfast(adjective, strong, tough, firm, solid) |
| inflexible(adjective, mean, strong, hard, tough) |
| persevering(adjective, strong, tough, firm, ready) |
| adamant(adjective, mean, strong, hard, tough) |
| indefatigable(adjective, strong, firm, determined, steady) |
| pigheaded(adjective, mean, hard, tough, resist) |
| headstrong(adjective, tough, firm, resist, determined) |
| mulish(adjective, mean, strong, hard, tough) |
| unwavering(adjective, strong, firm, solid, determined) |
| inexorable(adjective, appearance, mean, hard, tough) |