| devoted(adjective, resolute) |
| disciplinary(adjective, strong, hard, tough, severe) |
| dispassionate |
| dog-eat-dog(adjective, mean, hard, severe, harsh) |
| dour |
| dyed-in-the-wool(adjective, set, strong, hard, tough) |
| earnest(adjective, resolute) |
| excruciating(adjective, evil, nasty, harsh, vicious) |
| faithful(adjective, resolute) |
| fearless(adjective, resolute) |
| feral(adjective, mean, harsh, violent, cruel) |
| forbidding(adjective, appearance, strong, hard, tough) |
| frightful(adjective, appearance, violent, terrible, cruel) |
| frowning(adjective, strong, hard, tough, severe) |
| go for broke(expression, adjective, idiom, harsh, cruel) |
| gratuitous(adjective, mean, severe, harsh, cruel) |
| grudgeful |
| hang-tough(adjective, strong, hard, tough, harsh) |
| hang in(expression, adjective, harsh, cruel, determined) |
| hanging tough(expression, adjective, mean, hard, rigid) |