| merciless(adjective, hard, tough, harsh, cruel) |
| murderous(adjective, hard, tough, harsh, cruel) |
| obtuse(adjective, hard, unfeeling, unsympathetic, prepared) |
| pitiless(adjective, hard, tough, harsh, cruel) |
| prepared(adjective, hard, unfeeling, unsympathetic, hardened) |
| relentless(adjective, hard, tough, harsh, cruel) |
| remorseless |
| resistant(adjective, hard, unfeeling, unsympathetic, prepared) |
| rigorous(adjective, hard, tough, harsh, cruel) |
| ruthless(adjective, hard, tough, harsh, cruel) |
| sanguinary(adjective, hard, tough, harsh, cruel) |
| savage(adjective, hard, tough, harsh, cruel) |
| seasoned(adjective, hard, unfeeling, unsympathetic, prepared) |
| shameless(adjective, hard, tough, harsh, cruel) |
| sour(adjective, hard, tough, harsh, cruel) |
| steeled(adjective, hard, unfeeling, unsympathetic, prepared) |
| tough(adjective, hard, harsh, cruel, grim) |
| toughened(adjective, hard, unfeeling, unsympathetic, hardened) |
| tyrannical(adjective, hard, tough, harsh, cruel) |
| unapologetic |