| rough(adjective, hard, severe, difficult, heavy) |
| backbreaking(adjective, hard, difficult, heavy, cruel) |
| disturbing(adjective, hard, difficult, complex, troublesome) |
| grinding(adjective, hard, difficult, cruel, complex) |
| lumpish(adjective, hard, difficult, complex, gravity) |
| massive(adjective, hard, difficult, complex, gravity) |
| operose(adjective, hard, tough, difficult, complex) |
| unbearable(adjective, hard, difficult, complex, painful) |
| complicated(adjective, hard, difficult, complex, awkward) |
| knotty(adjective, hard, difficult, complex, awkward) |
| tricky(adjective, hard, difficult, complex, awkward) |
| complex(adjective, hard, difficult) |
| lumpy(adjective, hard, difficult, complex, gravity) |
| stressful(adjective, hard, difficult, complex) |
| thorny(adjective, hard, difficult, complex) |
| tight(adjective, hard, difficult, complex) |
| ambitious(adjective, hard, difficult, complex) |
| cruel(adjective, hard, difficult, complex, painful) |
| heavyweight(adjective, hard, difficult, heavy, complex) |
| intricate(adjective, hard, difficult, complex, awkward) |