| merciless(adjective, appearance, mean, hard, tough) |
| cruel(adjective, appearance, mean, hard, tough) |
| pitiless(adjective, animal, mean, hard, tough) |
| savage(adjective, animal, mean, hard, tough) |
| brutal(adjective, mean, hard, tough, severe) |
| inhuman(adjective, animal, mean, hard, tough) |
| harsh(adjective, mean, hard, tough, severe) |
| heartless(adjective, mean, feeling, hard, tough) |
| unmerciful(adjective, mean, hard, tough, severe) |
| barbarous(adjective, animal, appearance, mean, hard) |
| remorseless(adjective, animal, mean, severe, harsh) |
| callous(adjective, mean, hard, tough, severe) |
| unfeeling(adjective, animal, mean, severe, evil) |
| cold-blooded(adjective, mean, hard, tough, severe) |
| hard(adjective, mean, tough, severe, evil) |
| relentless(adjective, animal, appearance, mean, hard) |
| unsympathetic(adjective, animal, mean, hard, tough) |
| ferocious(adjective, animal, mean, hard, evil) |
| fierce(adjective, animal, mean, hard, tough) |
| unrelenting(adjective, animal, appearance, mean, hard) |