| strenuous(adjective, tough, rough, difficult, heavy) |
| bothersome(adjective, tough, rough, difficult, heavy) |
| demanding(adjective, tough, rough, difficult, heavy) |
| difficile(adjective, tough, rough, difficult, heavy) |
| distressing(adjective, tough, rough, difficult, heavy) |
| effortful(adjective, tough, rough, difficult, heavy) |
| exacting(adjective, tough, rough, difficult, heavy) |
| exhausting(adjective, tough, rough, difficult, heavy) |
| fatiguing(adjective, tough, rough, difficult, heavy) |
| formidable(adjective, tough, rough, difficult, heavy) |
| hairy(adjective, tough, rough, difficult, heavy) |
| herculean(adjective, tough, rough, difficult, heavy) |
| irksome(adjective, tough, rough, difficult, heavy) |
| labored(adjective, tough, rough, difficult, heavy) |
| mean(adjective, tough, rough, difficult, heavy) |
| merciless(adjective, tough, rough, difficult, heavy) |
| murder(adjective, tough, rough, difficult, heavy) |
| onerous(adjective, tough, rough, difficult, heavy) |
| rigorous(adjective, tough, rough, difficult, heavy) |
| scabrous(adjective, tough, rough, difficult, heavy) |