| laborious(adjective, hard, difficult, heavy, complex) |
| arduous(adjective, hard, difficult, heavy, complex) |
| hard(adjective, difficult, heavy, complex, awkward) |
| punishing(adjective, hard, difficult, complex, strenuous) |
| toilsome(adjective, hard, difficult, complex, awkward) |
| operose(adjective, hard, difficult, complex, awkward) |
| oppressive(adjective, hard, difficult, heavy, complex) |
| tough(adjective, hard, difficult, heavy, complex) |
| burdensome(adjective, hard, difficult, heavy, cruel) |
| severe(adjective, hard, difficult, heavy, cruel) |
| taxing(adjective, hard, difficult, heavy, complex) |
| weighty(adjective, hard, difficult, heavy, complex) |
| difficult(adjective, hard, heavy, complex, awkward) |
| rough(adjective, hard, difficult, heavy, complex) |
| trying(adjective, hard, difficult, heavy, complex) |
| complicated(adjective, hard, difficult, complex, awkward) |
| grievous(adjective, hard, difficult, complex) |
| grinding(adjective, hard, difficult, cruel, complex) |
| hefty(adjective, hard, difficult, complex) |
| intricate(adjective, hard, difficult, complex, awkward) |