| fierce(adjective, characteristic, difficulty, pain) |
| flinty(adjective, characteristic, difficulty, pain) |
| formidable(adjective, characteristic, difficulty, pain) |
| grueling(adjective, characteristic, difficulty, pain) |
| hard(adjective, characteristic, difficulty, pain) |
| hateful(adjective, characteristic, difficulty, pain) |
| heavy(adjective, characteristic, difficulty, pain) |
| hellish(adjective, characteristic, difficulty, pain) |
| implacable(adjective, characteristic, difficulty, pain) |
| inexorable(adjective, characteristic, difficulty, pain) |
| inhuman(adjective, characteristic, difficulty, pain) |
| inhumane(adjective, characteristic, difficulty, pain) |
| labored(adjective, characteristic, difficulty, pain) |
| laborious(adjective, characteristic, difficulty, pain) |
| malevolent(adjective, characteristic, difficulty, pain) |
| merciless(adjective, characteristic, difficulty, pain) |
| monstrous(adjective, characteristic, difficulty, pain) |
| murder(adjective, characteristic, difficulty, pain) |
| no picnic(adjective, characteristic, difficulty, pain) |
| onerous(adjective, characteristic, difficulty, pain) |