| troublesome(adjective, hard, tough, severe, difficulty) |
| uphill(adjective, hard, great, tough, easy) |
| formidable(adjective, tough, severe, difficulty, rough) |
| sedulous(adjective, work, labour, assiduous, hardworking) |
| gruelling |
| wearying(adjective, dull, difficult, awkward, boring) |
| exacting(adjective, dull, hard, tough, severe) |
| grueling(adjective, hard, tough, severe, difficult) |
| hard-working(adjective, work, labour, painstaking, multitask) |
| tiresome(adjective, dull, hard, difficult, heavy) |
| laboured |
| strained(adjective, hard, difficult, exertion) |
| detailed |
| effortful(adjective, hard, great, tough, rough) |
| painstaking(adjective, hardworking) |
| wearing(adjective, dull, hard, difficult, awkward) |
| workaholic |
| busy(adjective, work, labour, multitask) |
| forced(adjective, hard, difficult) |
| labored(adjective, hard, great, tough, rough) |