| unwavering(adjective, determined, resolute, obstinate, uncompromising) |
| adamantine(adjective, strong, hard, tough, determined) |
| brass-bound(adjective, determined, resolute, obstinate, uncompromising) |
| bull-headed(adjective, determined, resolute, obstinate, uncompromising) |
| hidebound(adjective, determined, resolute, obstinate, uncompromising) |
| inelastic(adjective, determined, resolute, obstinate, uncompromising) |
| callous(adjective, mean, hard, tough, evil) |
| dogged(adjective, mean, hard, determined, resolute) |
| hardened(adjective, hard, determined, resolute, unfeeling) |
| matter-of-fact(adjective, practical, realistic) |
| stiff-necked(adjective, mean, strong, hard, tough) |
| well-versed |
| bullheaded(adjective, strong, hard, tough, determined) |
| dour(adjective, close, hard, severe, sharp) |
| down-to-earth(adjective, practical, realistic) |
| grim(adjective, strong, hard, tough, severe) |
| hanging(adjective, determined, resolute, obstinate, uncompromising) |
| headstrong(adjective, hard, tough, rough, harsh) |
| implacable(adjective, mean, strong, hard, tough) |
| opinionated(adjective, determined, resolute, uncompromising, unshakeable) |