| implacable(adjective, animal, appearance, mean, strong) |
| hideous(adjective, appearance, bad, unpleasant, awful) |
| uncompromising(adjective, severe, harsh, resist, cruel) |
| macabre(adjective, bad, awful, terrible, beautiful) |
| stubborn(adjective, characteristic, appearance, quality, strong) |
| sinister(adjective, person, appearance, sad, sorrow) |
| cheerless(adjective, person, dull, blue, sad) |
| frightful(adjective, appearance, pain, unpleasant, awful) |
| grave(adjective, sorrow, gloomy, depress, sadness) |
| unyielding(adjective, appearance, mean, strong, hard) |
| appalling(adjective, sad, pain, unhappy, unpleasant) |
| cruel(adjective, person, appearance, mean, strong) |
| depressing(adjective, person, dull, blue, sad) |
| glum(adjective, person, appearance, blue, low) |
| horrible(adjective, dull, offensive, unpleasant, awful) |
| melancholy(adjective, person, dull, blue, low) |
| somber(adjective, person, dull, quiet, appearance) |
| brutal(adjective, person, mean, tough, severe) |
| inflexible(adjective, strong, hard, tough, severe) |
| obdurate(adjective, mean, strong, hard, tough) |