| ruthless(adjective, characteristic, difficulty, pain) |
| unfeeling(adjective, characteristic, difficulty, pain) |
| unkind(adjective, characteristic, difficulty, pain) |
| atrocious(adjective, characteristic, difficulty, pain) |
| backbreaking(adjective, characteristic, difficulty, pain) |
| barbarous(adjective, characteristic, difficulty, pain) |
| bestial(adjective, characteristic, difficulty, pain) |
| bitter(adjective, characteristic, difficulty, pain) |
| bloodthirsty(adjective, characteristic, difficulty, pain) |
| brutal(adjective, characteristic, difficulty, pain) |
| brutish(adjective, characteristic, difficulty, pain) |
| burdensome(adjective, characteristic, difficulty, pain) |
| degenerate(adjective, characteristic, difficulty, pain) |
| demoniac(adjective, characteristic, difficulty, pain) |
| depraved(adjective, characteristic, difficulty, pain) |
| evil(adjective, characteristic, difficulty, pain) |
| excruciating(adjective, characteristic, difficulty, pain) |
| exhausting(adjective, characteristic, difficulty, pain) |
| fatiguing(adjective, characteristic, difficulty, pain) |
| ferocious(adjective, characteristic, difficulty, pain) |