| burdensome(adjective, dull, hard, tough, severe) |
| difficult(adjective, dull, hard, great, tough) |
| arduous(adjective, dull, hard, great, tough) |
| laborious(adjective, dull, hard, great, tough) |
| hard(adjective, dull, great, tough, severe) |
| strenuous(adjective, dull, great, tough, difficult) |
| tough(adjective, dull, hard, great, severe) |
| demanding(adjective, dull, hard, tough, severe) |
| oppressive(adjective, dull, hard, tough, severe) |
| severe(adjective, hard, tough, rough, difficult) |
| toilsome(adjective, hard, great, tough, difficulty) |
| troublesome(adjective, hard, tough, severe, difficulty) |
| cumbersome(adjective, difficult, pain, hindrance) |
| formidable(adjective, tough, severe, difficulty, difficult) |
| harsh(adjective, severe, difficult) |
| heavy(adjective, dull, tough, severe, difficult) |
| grievous(adjective, hard, severe, difficult, harsh) |
| grinding(adjective, rough, difficult, heavy, cruel) |
| exacting(adjective, dull, hard, tough, severe) |
| irksome(adjective, dull, difficulty, difficult, heavy) |