| arduous(adjective, hard, difficult, complex, awkward) |
| backbreaking(adjective, hard, difficult, complex, awkward) |
| burdensome(adjective, hard, difficult, complex, awkward) |
| complicated(adjective, hard, difficult, complex, awkward) |
| grinding(adjective, hard, difficult, complex, awkward) |
| hard(adjective, difficult, complex, awkward, demanding) |
| intricate(adjective, hard, difficult, complex, awkward) |
| involved(adjective, hard, difficult, complex, awkward) |
| knotty(adjective, hard, difficult, complex, awkward) |
| laborious(adjective, hard, difficult, complex, awkward) |
| operose(adjective, hard, difficult, complex, awkward) |
| rough(adjective, hard, difficult, complex, awkward) |
| rugged(adjective, hard, difficult, complex, awkward) |
| serious(adjective, hard, difficult, complex, awkward) |
| severe(adjective, hard, difficult, complex, awkward) |
| sticky(adjective, hard, difficult, complex, awkward) |
| toilsome(adjective, hard, difficult, complex, awkward) |
| difficult(adjective, hard, complex, awkward, demanding) |
| tricky(adjective, hard, difficult, complex, awkward) |
| time-consuming |