| merciless(adjective, mean, hard, kind, tough) |
| ruthless(adjective, mean, hard, tough, severe) |
| cruel(adjective, mean, severe, harsh, violent) |
| pitiless(adjective, mean, hard, kind, tough) |
| unpitying(noun, adjective, mean, severe, harsh) |
| callous(adjective, mean, severe, harsh, cruel) |
| heartless(adjective, mean, severe, harsh, cruel) |
| remorseless(adjective, mean, hard, kind, severe) |
| brutal(adjective, mean, severe, harsh, violent) |
| unfeeling(adjective, mean, severe, harsh, cruel) |
| uncompassionate(adjective, mean, hard, tough, harsh) |
| hard(adjective, mean, tough, severe, harsh) |
| relentless(adjective, mean, hard, tough, severe) |
| harsh(adjective, mean, hard, tough, severe) |
| cutthroat(adjective, mean, severe, harsh, cruel) |
| hardhearted(adjective, mean, severe, harsh, cruel) |
| unforgiving(adjective, mean, hard, tough, severe) |
| unkind(adjective, mean, severe, harsh, cruel) |
| cold-blooded(adjective, mean, harsh, cruel, vicious) |
| hard-hearted(adjective, mean, hard, tough, harsh) |