| stubborn(adjective, characteristic, quality, obstinate, stubbornness) |
| tenacious(adjective, strong, tough, firm, difficult) |
| dogged(adjective, strong, tough, firm, energetic) |
| unyielding(adjective, tough, determined, resolute, obstinate) |
| obstinate(adjective, mean, strong, tough, continue) |
| persistent(adjective, strong, tough, continue, firm) |
| resolute(adjective, strong, tough, firm, determined) |
| inflexible(adjective, determined, resolute, obstinate, stubborn) |
| determined(adjective, strong, tough, firm, deliberate) |
| firm(noun, adjective, strong, tough, determined) |
| mulish(adjective, strong, tough, firm, difficult) |
| headstrong(adjective, strong, tough, firm, difficult) |
| obdurate(adjective, determined, resolute, obstinate, stubborn) |
| pigheaded(adjective, tough, firm, difficult, resist) |
| adamant(adjective, tough, determined, resolute, obstinate) |
| bullheaded(adjective, tough, difficult, resist, wild) |
| hardheaded(adjective, strong, tough, resist, cold) |
| intractable(adjective, strong, tough, firm, difficult) |
| intransigent(adjective, determined, resolute, obstinate, stubborn) |
| steadfast(adjective, tough, firm, determined, resolute) |