| ruthless(adjective, animal, mean, hard, tough) |
| cruel(adjective, mean, hard, tough, severe) |
| merciless(adjective, mean, hard, kind, tough) |
| brutal(adjective, person, mean, hard, tough) |
| harsh(adjective, mean, hard, tough, severe) |
| heartless(adjective, mean, feeling, hard, tough) |
| savage(adjective, animal, mean, hard, tough) |
| unfeeling(adjective, animal, person, mean, hard) |
| inhuman(adjective, animal, person, mean, hard) |
| unmerciful(adjective, mean, hard, kind, tough) |
| unsympathetic(adjective, animal, person, mean, hard) |
| remorseless(adjective, animal, mean, kind, severe) |
| barbaric(adjective, animal, person, mean, violent) |
| callous(adjective, mean, hard, tough, severe) |
| hard-hearted(adjective, mean, hard, tough, severe) |
| severe(adjective, person, mean, hard, tough) |
| hard(adjective, mean, tough, severe, nasty) |
| unkind(adjective, animal, mean, hard, tough) |
| fierce(adjective, animal, mean, hard, tough) |
| unpitying(noun, adjective, mean, severe, harsh) |