| difficult(adjective, dull, hard, great, tough) |
| hard(adjective, dull, great, tough, easy) |
| laborious(adjective, dull, hard, great, tough) |
| tough(adjective, dull, hard, great, easy) |
| toilsome(adjective, hard, great, tough, difficulty) |
| burdensome(adjective, dull, hard, tough, severe) |
| severe(adjective, hard, tough, rough, difficult) |
| painful(adjective, hard, difficult, complex, painful) |
| strenuous(adjective, dull, great, tough, severe) |
| operose(adjective, hard, tough, severe, difficulty) |
| rough(adjective, hard, great, tough, severe) |
| backbreaking(adjective, hard, difficult, heavy, complex) |
| trying(adjective, dull, hard, tough, severe) |
| rugged(adjective, hard, severe, rough, difficult) |
| complex(adjective, hard, difficult, tedious, demanding) |
| grievous(adjective, hard, difficult, complex, painful) |
| oppressive(adjective, dull, hard, tough, severe) |
| punishing(adjective, hard, difficult, complex) |
| sore(adjective, hard, difficult, complex, painful) |
| taxing(adjective, hard, tough, severe, rough) |