| stubborn(adjective, resolute, determined, uncompromising, obstinate) |
| firm(adjective, set, mean, clear, strong) |
| rigid(adjective, mean, strong, hard, tough) |
| stiff(adjective, strong, hard, tough, strain) |
| inflexible(adjective, mean, strong, hard, secure) |
| uncompromising(adjective, mean, clear, hard, secure) |
| persistent(adjective, strong, tough, strain, flat) |
| hard(adjective, mean, strong, tough, easy) |
| determined(adjective, clear, strong, hard, tough) |
| obdurate(adjective, mean, strong, hard, secure) |
| unbending(adjective, mean, clear, strong, hard) |
| inexorable(adjective, appearance, mean, strong, hard) |
| intransigent(adjective, resist, determined, resolute, obstinate) |
| unrelenting(adjective, appearance, mean, strong, hard) |
| obstinate(adjective, mean, strong, hard, tough) |
| resolute(adjective, appearance, clear, strong, hard) |
| steadfast(adjective, clear, strong, secure, tough) |
| strong(adjective, set, hard, sound, tough) |
| adamant(adjective, mean, strong, hard, secure) |
| relentless(adjective, appearance, mean, strong, hard) |