| hard-boiled(adjective, hard, unfeeling, unsympathetic, hardened) |
| hard-hearted(adjective, hard, tough, harsh, cruel) |
| hard as nails(expression, adjective, idiom, unfeeling, callous) |
| hardhearted(adjective, hard, unfeeling, unsympathetic, hardened) |
| harsh(adjective, hard, tough, cruel, grim) |
| heartless(adjective, hard, unfeeling, unsympathetic, hardened) |
| impenetrable(adjective, hard, unfeeling, unsympathetic, prepared) |
| impenitent(adjective, hard, tough, harsh, cruel) |
| impious(adjective, hard, unfeeling, unsympathetic, prepared) |
| implacable(adjective, hard, tough, harsh, cruel) |
| inaccessible(adjective, hard, unfeeling, unsympathetic, prepared) |
| indurated(adjective, hard, unfeeling, unsympathetic, hardened) |
| inexorable(adjective, hard, tough, harsh, cruel) |
| inhuman(adjective, hard, tough, harsh, cruel) |
| inhumane(adjective, hard, tough, harsh, cruel) |
| insensitive(adjective, hard, tough, harsh, cruel) |
| insolent |
| intolerant(adjective, hard, tough, harsh, cruel) |
| inured(adjective, hard, unfeeling, unsympathetic, hardened) |
| irreverent(adjective, hard, unfeeling, unsympathetic, prepared) |