| backbreaking(adjective, hard, difficult, heavy, complex) |
| grinding(adjective, hard, difficult, complex, severity) |
| hefty(adjective, dull, hard, difficult, harsh) |
| massive(adjective, hard, difficult, heavy, complex) |
| harsh(adjective, hard, tough, severe, rough) |
| ponderous(adjective, hard, difficult, heavy, complex) |
| rough(adjective, hard, severe, difficult, heavy) |
| toilsome(adjective, hard, difficult, complex) |
| heavy(adjective, dull, severe, warm, difficult) |
| complex(adjective, hard, difficult, tedious, demanding) |
| complicated(adjective, hard, difficult, complex, tedious) |
| onerous(adjective, dull, hard, tough, severe) |
| punishing(adjective, hard, difficult, complex) |
| stressful(adjective, hard, difficult, complex) |
| tight(adjective, hard, difficult, complex) |
| disturbing(adjective, hard, difficult, complex) |
| fusty(adjective, hard, warm, difficult, complex) |
| knotty(adjective, hard, difficult, complex) |
| rugged(adjective, hard, difficult, complex) |
| serious(adjective, hard, difficult, complex) |