| rocklike(adjective, firm, stiff, rigid) |
| ruthless(adjective, mean, hard, tough, severe) |
| dispassionate(adjective, cold, indifferent, unsympathetic, impassive) |
| granitic(adjective, hardness) |
| hard-hearted(adjective, mean, hard, tough, severe) |
| hardhearted(adjective, mean, hard, harsh, careless) |
| harsh(adjective, mean, hard, cool, unpleasant) |
| icy(adjective, mean, hard, cool, tough) |
| rough(adjective, person, hard, feelings, coarse) |
| aloof(adjective, mean, hard, cool, unpleasant) |
| determined(adjective, tenacious) |
| granitelike |
| impassive(adjective, hard, careless, cold, indifferent) |
| impenetrable(adjective, hard, firm, stiff, unfeeling) |
| intractable |
| thick-skinned(adjective, hard, tough, severe, careless) |
| unforgiving(adjective, person, mean, hard, harsh) |
| bouldery |
| hostile(adjective, person, hard, indifferent, feelings) |
| rugged(adjective, set, hard, harsh, coarse) |