| rigorous(adjective, strong, hard, tough, severe) |
| acrimonious(adjective, mean, hard, tough, severe) |
| dissonant(adjective, characteristic, severe, rough, offensive) |
| hoarse(adjective, characteristic, severe, rough, offensive) |
| unsympathetic(adjective, characteristic, mean, hard, cool) |
| acrid(adjective, characteristic, tough, severe, taste) |
| nasty(adjective, characteristic, mean, hard, cool) |
| relentless(adjective, characteristic, mean, strong, hard) |
| rude(adjective, characteristic, mean, simple, severe) |
| biting(adjective, characteristic, mean, strong, hard) |
| cacophonous(adjective, characteristic, severe, rough, unpleasant) |
| cutting(adjective, characteristic, mean, strong, hard) |
| dour(adjective, characteristic, tough, severe, nasty) |
| grim(adjective, characteristic, appearance, mean, strong) |
| gruff(adjective, characteristic, sound, severe, sharp) |
| sour(adjective, characteristic, hard, tough, severe) |
| stark(adjective, characteristic, severe, rough, attitude) |
| unfeeling(adjective, characteristic, mean, hard, cool) |
| caustic(adjective, characteristic, mean, hard, severe) |
| exacting(adjective, characteristic, hard, tough, easy) |