| ruthless(adjective, animal, mean, severe, harsh) |
| pitiless(adjective, animal, mean, kind, severe) |
| unrelenting(adjective, animal, mean, tough, severe) |
| callous(adjective, mean, harsh, cold, cruel) |
| cruel(adjective, mean, severe, harsh, violent) |
| inexorable(adjective, mean, tough, harsh, resist) |
| relentless(adjective, animal, mean, tough, severe) |
| unmerciful(adjective, mean, hard, kind, severe) |
| unyielding(adjective, mean, harsh, resist, cruel) |
| implacable(adjective, animal, mean, tough, severe) |
| merciless(adjective, mean, kind, severe, harsh) |
| savage(adjective, animal, mean, hard, harsh) |
| shameless |
| harsh(adjective, mean, severe, violent, cruel) |
| heartless(adjective, mean, severe, harsh, violent) |
| inflexible(adjective, harsh, resist, cruel, determined) |
| obdurate(adjective, mean, tough, harsh, resist) |
| unbending(adjective, tough, harsh, resist, cruel) |
| impenitent(adjective, regret, impenitent, unrepentant, impenitence) |
| unpitying(noun, adjective, severe, harsh, cruel) |