| murder(adjective, tough, rough, difficult, heavy) |
| no picnic(expression, adjective, tough, severe, painful) |
| onerous(adjective, tough, severe, rough, difficult) |
| painful(adjective, tough, severe, problematic, trying) |
| problem(adjective, tough, severe, painful, problematic) |
| problematic(adjective, tough, severe, painful, trying) |
| prohibitive(adjective, tough, severe, painful, problematic) |
| rigid(adjective, tough, severe, painful, problematic) |
| scabrous(adjective, tough, rough, difficult, heavy) |
| serious(adjective, tough, rough, difficult, heavy) |
| slavish(adjective, tough, rough, difficult, heavy) |
| spiny |
| steep |
| sticky(adjective, tough, rough, difficult, heavy) |
| stiff(adjective, tough, severe, painful, problematic) |
| strenuous(adjective, tough, severe, rough, difficult) |
| terrible(adjective, tough, rough, difficult, heavy) |
| thorny |
| ticklish |
| tiring(adjective, tough, rough, difficult, heavy) |