| consequential(adjective, harsh, importance, big, heavy) |
| grim(adjective, sorrow, gloomy, depress, sadness) |
| heavyweight(adjective, hard, difficult, important, complex) |
| laborious(adjective, hard, tough, severe, difficult) |
| precarious(adjective, hard, difficult, complex, dangerous) |
| profound(adjective, hard, difficult, complex, greatness) |
| backbreaking(adjective, hard, difficult, complex) |
| disturbing(adjective, hard, difficult, complex) |
| esoteric(adjective, hard, difficult, complex) |
| leaden(adjective, hard, difficult, gloomy, complex) |
| massive(adjective, hard, difficult, complex) |
| operose(adjective, hard, tough, severe, difficult) |
| oppressive(adjective, hard, difficult, complex) |
| rough(adjective, hard, difficult, unpleasant, complex) |
| sensitive(adjective, hard, difficult, complex) |
| sore(adjective, hard, difficult, pain, complex) |
| tough(adjective, hard, severe, difficult, harsh) |
| hell(noun, adjective, place, hard, difficult) |
| tomb(noun, place, end, keep, release) |
| arduous(adjective, hard, difficult, complex) |