| brutal(adjective, mean, hard, evil, nasty) |
| bullheaded(adjective, strong, hard, tough, determined) |
| contrary(adjective, determined, resolute, persistent, obstinate) |
| decided(adjective, determined, resolution, resolute, expected) |
| hard-line(adjective, strong, hard, tough, firm) |
| heartless(adjective, mean, hard, tough, severe) |
| imperative(adjective, strong, severity, overwhelming, required) |
| ironclad(adjective, cruel, pitiless) |
| pigheaded(adjective, mean, hard, tough, determined) |
| steady(adjective, determined, resolution, resolute, persistent) |
| uncompassionate(adjective, mean, hard, tough, harsh) |
| unmoved |
| unsparing(adjective, mean, strong, hard, tough) |
| constant(adjective, resolute, persistent, pitiless, unyielding) |
| contumacious(adjective, tough, firm, persistent, obstinate) |
| dead set(adjective, determined, resolute, uncompromising, unshakeable) |
| destined(adjective, expected, predictable, necessary, intended) |
| flinty(adjective, close, strong, hard, tough) |
| forbidding(adjective, close, appearance, strong, hard) |
| ghastly(adjective, appearance, terrible, hopeless) |