| hard-nosed(adjective, determined, resolute, obstinate, uncompromising) |
| unalterable |
| breakable |
| fixed(adjective, severe, firm, harsh, solid) |
| hardheaded(adjective, determined, resolute, obstinate, uncompromising) |
| intractable(adjective, tough, firm, fixed, distant) |
| mulish(adjective, determined, resolute, obstinate, uncompromising) |
| rigorous |
| set(adjective, hard, tough, severe, firm) |
| solid(adjective, hard, tough, severe, firm) |
| steely(adjective, hard, firm, solid, stiff) |
| bigoted(adjective, determined, resolute, obstinate, uncompromising) |
| brass-bound(adjective, determined, resolute, obstinate, uncompromising) |
| bull-headed(adjective, determined, resolute, obstinate, uncompromising) |
| contrary(adjective, determined, resolute, obstinate, uncompromising) |
| determined(adjective, resolute, obstinate, uncompromising, unshakeable) |
| hidebound(adjective, determined, resolute, obstinate, uncompromising) |
| immutable |
| inductile(adjective, unflexible) |
| intransigent(adjective, determined, resolute, obstinate, uncompromising) |