| strenuous(adjective, hard, severe, rough, difficult) |
| uphill(adjective, hard, tough, severe, rough) |
| warped(adjective, gnarled) |
| Daedalian(adjective, simple) |
| confusing(adjective, hard, complex, tricky, complicated) |
| effortful(adjective, hard, tough, severe, rough) |
| entangled(adjective, hard, fancy, obscure, difficult) |
| mazy(adjective, troublesome) |
| obscure(adjective, hard, difficult, complex, sophisticated) |
| onerous(adjective, hard, tough, severe, rough) |
| recondite(adjective, hard, fancy, evil, obscure) |
| terrible(adjective, tough, rough, difficult, heavy) |
| wearying(adjective, tough, rough, difficult, heavy) |
| winding |
| confused |
| crooked |
| debatable(adjective, tricky, sticky, challenging) |
| dense(adjective, difficult, complex, involved, complicated) |
| distorted(adjective, gnarled) |
| harsh(adjective, hard, rough, difficult, coarse) |