| involved(adjective, hard, difficult, complex, awkward) |
| knotted(adjective, hard, difficult, complex) |
| problematic(adjective, hard, difficult, complex) |
| toilful(adjective, hard, difficult, complex, awkward) |
| dire(adjective, hard, difficult, complex) |
| disturbing(adjective, hard, difficult, complex) |
| industrious(adjective, work, labour, painstaking, hardworking) |
| nasty(adjective, hard, difficult, complex) |
| sensitive(adjective, hard, difficult, complex) |
| sore(adjective, hard, difficult, complex) |
| wearisome(adjective, dull, hard, tough, difficult) |
| diligent(adjective, work, labour, persevering, painstaking) |
| fatiguing(adjective, dull, hard, difficult, awkward) |
| exhausting(adjective, dull, hard, difficult, awkward) |
| assiduous(adjective, work, labour, painstaking, hardworking) |
| time-consuming(slow, heavy, arduous, burdensome) |
| demanding(adjective, dull, hard, tough, severe) |
| heavy(adjective, dull, hard, tough, severe) |
| stiff(adjective, hard, tough, severe, rough) |
| tiring(adjective, dull, tough, difficult, awkward) |