| relentless(adjective, animal, mean, hard, tough) |
| sharp(adjective, mean, strong, great, severe) |
| untamed(adjective, simple, severe, violent, wild) |
| acute(adjective, strong, great, severe, sharp) |
| bestial(adjective, animal, mean, kind, evil) |
| homicidal(adjective, characteristic, cruel, vicious, grim) |
| pitiless(adjective, animal, mean, hard, tough) |
| strong(adjective, strong, severe, difficult, intense) |
| ardent(adjective, strong, keen, nasty, difficult) |
| cutthroat(adjective, mean, severe, harsh, violent) |
| impetuous(adjective, strong, severe, difficult, intense) |
| tumultuous(adjective, violent, confused) |
| extreme(adjective, strong, great, sharp, harsh) |
| frantic(adjective, harsh, intense, passionate, violent) |
| rough(adjective, hard, simple, harsh, violent) |
| terrible(adjective, strong, hard, great, severe) |
| uncontrollable(adjective, hard, severe, rough, harsh) |
| wicked(noun, adjective, mean, clear, bad) |
| awful(adjective, great, tough, violent, terrible) |
| dangerous(adjective, tough, difficult, violent, wicked) |