| severe(adjective, hard, difficult, harsh, pain) |
| hard(adjective, difficult, harsh, pain, cruel) |
| oppressive(adjective, hard, difficult, complex, severity) |
| arduous(adjective, hard, difficult, harsh, cruel) |
| burdensome(adjective, hard, difficult, cruel, complex) |
| laborious(adjective, hard, difficult, complex, awkward) |
| rough(adjective, hard, difficult, complex, awkward) |
| toilsome(adjective, hard, difficult, harsh, cruel) |
| difficult(adjective, hard, difficult, harsh, cruel) |
| knotty(adjective, hard, difficult, complex, awkward) |
| complicated(adjective, hard, difficult, complex, awkward) |
| cruel(adjective, hard, difficult, pain, complex) |
| rugged(adjective, hard, difficult, harsh, cruel) |
| tricky(adjective, hard, difficult, complex, awkward) |
| trying(adjective, hard, difficult, complex) |
| backbreaking(adjective, hard, difficult, cruel, complex) |
| complex(adjective, hard, difficult) |
| disturbing(verb, adjective, hard, difficult, complex) |
| grave(adjective, hard, difficult, pain, complex) |
| involved(adjective, hard, difficult, complex, awkward) |