| harsh(adjective, mean, hard, tough, easy) |
| severe(adjective, appearance, mean, hard, tough) |
| rigid(adjective, hard, tough, easy, severe) |
| hard(adjective, person, mean, tough, easy) |
| austere(adjective, appearance, hard, tough, severe) |
| strict(adjective, hard, tough, easy, severe) |
| grim(adjective, person, appearance, mean, tough) |
| rigorous(adjective, hard, tough, severe, rough) |
| cruel(adjective, person, appearance, mean, hard) |
| tough(adjective, hard, easy, severe, rough) |
| inflexible(adjective, hard, tough, severe, rough) |
| inexorable(adjective, appearance, mean, severe, harsh) |
| stringent(adjective, hard, tough, severe, rough) |
| uncompromising(adjective, severe, rough, harsh, determined) |
| adamant(adjective, mean, hard, rough, firm) |
| unsympathetic(adjective, person, mean, tough, severe) |
| unyielding(adjective, appearance, mean, hard, easy) |
| firm(noun, adjective, hard, tough, severe) |
| relentless(adjective, appearance, mean, severe, harsh) |
| unrelenting(adjective, appearance, mean, tough, severe) |