| graceless(adjective, hard, firm, solid, stiff) |
| grim(adjective, hard, tough, harsh, cruel) |
| habituated(adjective, set, hard, fixed, unfeeling) |
| hard-bitten(adjective, strong, hard, tough, careless) |
| hard-hearted(adjective, hard, tough, severe, harsh) |
| hardy(adjective, strong, tough) |
| harsh(adjective, hard, tough, cruel, grim) |
| headstrong(adjective, determined, fixed, resolute, uncompromising) |
| hostile(adjective, person, feelings, emotions, rocky) |
| immovable(adjective, determined, fixed, resolute, stubborn) |
| imperceptive(adjective, hard, indifferent, unkind, unresponsive) |
| implacable(adjective, hard, tough, harsh, cruel) |
| inconvincible(adjective, determined, resolute, uncompromising, unshakeable) |
| insensate(noun, adjective, hard, tough, severe) |
| intractable(adjective, determined, fixed, persistent, stubborn) |
| knowledgeable(experienced, veteran) |
| leathery(adjective, hard, durable) |
| mill |
| obtuse(noun, adjective, hard, indifferent, unfeeling) |
| passionless(adjective, cool, blank, aloof, unemotional) |