| slavish(adjective, tough, rough, difficult, heavy) |
| terrible(adjective, tough, rough, difficult, heavy) |
| tiring(adjective, tough, rough, difficult, heavy) |
| troublesome(adjective, tough, rough, difficult, heavy) |
| unsparing(adjective, tough, rough, difficult, heavy) |
| uphill(adjective, tough, rough, difficult, heavy) |
| uphill battle(expression, adjective, tough, rough, difficult) |
| wearing(adjective, tough, rough, difficult, heavy) |
| wearisome(adjective, tough, rough, difficult, heavy) |
| wearying(adjective, tough, rough, difficult, heavy) |
| awkward(adjective, difficult, demanding, grueling, problematical) |
| challenging(adjective, difficult, awkward, demanding, grueling) |
| grueling(adjective, difficult, awkward, demanding, problematical) |
| heavy(adjective, tough, rough, difficult, awkward) |
| problematical(adjective, difficult, awkward, demanding, grueling) |
| testing(adjective, difficult, awkward, demanding, grueling) |