| operose(adjective, hard, difficult, complex, awkward) |
| precarious(adjective, hard, difficult, complex) |
| problematic(adjective, hard, difficult, complex) |
| intricate(adjective, hard, difficult, delicate, complex) |
| involved(adjective, hard, difficult, delicate, complex) |
| messy(adjective, hard, difficult, terrible, dirty) |
| stodgy(adjective, hard, difficult, complex) |
| stubborn(adjective, hard, difficult, complex) |
| arduous(adjective, hard, difficult, complex, awkward) |
| backbreaking(adjective, hard, difficult, complex, awkward) |
| fusty(adjective, hard, difficult, heavy, complex) |
| grinding(adjective, hard, difficult, complex, awkward) |
| serious(adjective, hard, difficult, complex, awkward) |
| severe(adjective, hard, difficult, complex, awkward) |
| slab(adjective, hard, difficult, complex, semiliquidity) |
| stringy(adjective, feature, characteristic, structure) |
| toilful(adjective, hard, difficult, complex, awkward) |
| gummy(adjective, keep, secure, clean, thick) |
| burdensome(adjective, hard, difficult, complex, awkward) |
| disturbing(adjective, hard, difficult, complex) |