| trying(adjective, tough, severe, rough, difficult) |
| vigorous(adjective, strong, prevailing, influential, commanding) |
| weighty(adjective, severe, harsh, heavy, painful) |
| all-powerful(adjective, tough, difficult, overwhelming, prevailing) |
| complex(adjective, hard, difficult, delicate, heavy) |
| direful(adjective, fear) |
| dismaying(adjective, difficult, horrible, overwhelming, terrifying) |
| exacting(adjective, tough, severe, rough, difficult) |
| grisly(adjective, appearance, awful, terrible, shocking) |
| gruesome(adjective, appearance, awful, terrible, shocking) |
| harsh(adjective, hard, great, severe, rough) |
| indomitable(adjective, difficult, overwhelming) |
| influential(adjective, powerful, prevailing, commanding) |
| labored(adjective, tough, severe, difficult, heavy) |
| stiff(adjective, great, tough, severe, difficult) |
| sturdy(adjective, strong, prevailing, influential, commanding) |
| ticklish(adjective, bad, hard, tough, difficult) |
| titan(adjective, feature, characteristic, size) |
| tricky(adjective, hard, tough, difficult, complex) |
| troublesome(adjective, hard, tough, severe, evil) |