| inflexible(adjective, resist, determined, resolute, obstinate) |
| stubborn(adjective, characteristic, quality, tough, resist) |
| unyielding(adjective, resist, determined, resolute, obstinate) |
| obdurate(adjective, resist, determined, resolute, obstinate) |
| rigid(adjective, resist, determined, resolute, obstinate) |
| unbending(adjective, resist, determined, resolute, obstinate) |
| uncompromising(adjective, resist, determined, unreasonable, resolute) |
| inexorable(adjective, resist, determined, resolute, obstinate) |
| intransigent(adjective, resist, determined, resolute, obstinate) |
| unrelenting(adjective, resist, determined, resolute, obstinate) |
| adamantine(adjective, tough, firm, resist, determined) |
| incompliant(adjective, resist, determined, resolute, persistent) |
| implacable(adjective, tough, firm, resist, determined) |
| intractable(adjective, tough, firm, unreasonable, irritable) |
| iron(adjective, tough, resist, unreasonable, grim) |
| relentless(adjective, tough, firm, resist, determined) |
| adamant(adjective, tough, firm, resist, determined) |
| brassbound(adjective, resist, determined, resolute, persistent) |
| die-hard(adjective, resist, determined, resolute, persistent) |
| grim(adjective, resist, determined, resolute, persistent) |