| inflexible(adjective, mean, strong, hard, secure) |
| stubborn(adjective, characteristic, quality, mean, strong) |
| firm(noun, adjective, mean, strong, hard) |
| intransigent(adjective, determined, fixed, resolute, obstinate) |
| rigid(adjective, mean, strong, hard, secure) |
| obdurate(adjective, strong, hard, secure, tough) |
| resolute(adjective, secure, firm, solid, determined) |
| fixed(adjective, move, mean, strong, hard) |
| uncompromising(adjective, mean, hard, secure, determined) |
| unyielding(adjective, mean, strong, hard, secure) |
| determined(adjective, strong, hard, tough, usual) |
| inexorable(adjective, mean, strong, hard, tough) |
| set(adjective, strong, secure, firm, solid) |
| unbending(adjective, mean, strong, hard, tough) |
| unrelenting(adjective, mean, strong, hard, tough) |
| stiff(adjective, determined, resolute, rigid, obstinate) |
| unshakable(adjective, mean, strong, hard, secure) |
| relentless(adjective, mean, strong, hard, tough) |
| adamant(adjective, mean, strong, hard, secure) |
| obstinate(adjective, mean, hard, determined, usual) |