| painful(adjective, hard, tough, severe, difficult) |
| taxing(adjective, hard, difficult, harsh, heavy) |
| trying(adjective, dull, hard, tough, difficult) |
| weighty(adjective, hard, difficult, harsh, heavy) |
| exhausting(adjective, dull, hard, tough, difficult) |
| wearying(adjective, dull, difficult, awkward, boring) |
| exigent(adjective, difficult, harsh, heavy, demanding) |
| fatiguing(adjective, dull, difficult, awkward, boring) |
| vexatious(adjective, dull, severe, difficult, boring) |
| wearisome(adjective, dull, tough, severe, difficult) |
| bothersome(adjective, hard, tough, severe, difficult) |
| ponderous(adjective, difficult, heavy, cumbersome) |
| rugged(adjective, hard, tough, severe, rough) |
| tiring(adjective, dull, tough, difficult, awkward) |
| uphill(adjective, great, tough, severe, difficult) |
| crushing(adjective, difficult, heavy, troublesome, arduous) |
| effortful(adjective, great, tough, rough, difficult) |
| gruelling(adjective, tiresome) |
| backbreaking(adjective, hard, difficult, heavy, cruel) |
| distressing(adjective, hard, severe, rough, difficult) |