| frowning(adjective, dull, strong, hard, tough) |
| gaunt(adjective, sorrow, depress, sadness, emotion) |
| gruff(adjective, severe, sorrow, depress, sadness) |
| grumpy(adjective, appearance, informal, manner, sullen) |
| hopeless(adjective, person, dull, sad, harsh) |
| low(adjective, person, blue, sad, unhappy) |
| lowering(adjective, sorrow, depress, sadness, emotion) |
| menacing(adjective, black, baleful, bodeful) |
| monstrous(adjective, bad, awful, terrible, ugly) |
| obstinate(adjective, severe, determined, resolute, sullen) |
| repellent(adjective, bad, offensive, unpleasant, awful) |
| resolute(adjective, appearance, determined, manner, hopeless) |
| scowling(adjective, appearance, manner, sullen, hopeless) |
| strict(adjective, strong, hard, tough, severe) |
| tough(adjective, strong, hard, severe, firm) |
| abominable(adjective, mean, bad, nasty, offensive) |
| antagonistic(adjective, person, tough, severe, harsh) |
| astringent(adjective, strong, hard, tough, severe) |
| barbaric(adjective, animal, person, mean, violent) |
| barbarous(adjective, animal, appearance, mean, hard) |