| stressful(adjective, hard, difficult, complex) |
| difficult(adjective, dull, hard, tough, severe) |
| tough(adjective, dull, hard, rough, difficult) |
| burdensome(adjective, dull, hard, tough, difficult) |
| hard(adjective, dull, tough, severe, rough) |
| arduous(adjective, dull, hard, tough, severe) |
| taxing(adjective, hard, tough, severe, rough) |
| oppressive(adjective, dull, hard, tough, difficult) |
| painful(adjective, hard, difficult, complex, painful) |
| severe(adjective, hard, difficult, heavy, complex) |
| toilsome(adjective, hard, difficult, complex, weary) |
| tricky(adjective, hard, difficult, complex) |
| laborious(adjective, dull, hard, tough, severe) |
| rough(adjective, hard, difficult, heavy, complex) |
| thorny(adjective, hard, difficulty, difficult, complex) |
| tight(adjective, hard, difficult, complex, troublesome) |
| complicated(adjective, hard, difficulty, difficult, complex) |
| knotty(adjective, hard, difficulty, difficult, complex) |
| rugged(adjective, hard, difficulty, difficult, complex) |
| sticky(adjective, hard, difficult, complex) |