| hairy(adjective, tough, severe, rough, difficult) |
| hard-working(adjective, work, labour, multitask) |
| hardworking(adjective, work, labour, multitask) |
| herculean(adjective, tough, severe, difficult, awkward) |
| irksome(adjective, tough, rough, difficult, heavy) |
| labored(adjective, hard, tough, severe, difficult) |
| mean(adjective, severe, rough, difficult, violent) |
| no picnic(expression, hard, tough, severe, rough) |
| not easy(expression, tough, severe, painful, problematic) |
| painstaking |
| rigorous(adjective, hard, tough, severe, rough) |
| slavish(adjective, tough, rough, difficult, heavy) |
| thorough |
| tiring(adjective, hard, tough, rough, difficult) |
| titanic(tough, severe, painful, problematic, trying) |
| abstruse |
| backbreaker(tough, severe, painful, problematic, trying) |
| bothersome(adjective, tough, severe, rough, difficult) |
| brutal |
| challenging(adjective, tough, severe, difficult, awkward) |