| heedless(adjective, person, evil) |
| hellacious(adjective, bad behavior) |
| horrible |
| impenitent(adjective, hard, tough, harsh, cruel) |
| inaudacious(adjective, bad behavior) |
| inexorable(adjective, mean, hard, tough, severe) |
| insensate |
| insensible(adjective, mean, hard, harsh, cold) |
| intimidating(adjective, mean, sharp, harsh, cross) |
| intolerant(adjective, hard, tough, harsh, cruel) |
| invective(adjective, sharp, cross, fierce, hostile) |
| iron-fisted(adjective, mean, severe, harsh, cruel) |
| ironhearted |
| killer instinct(expression, adjective, mean, hard, harsh) |
| lupine(adjective, violent, cruel, vicious, fierce) |
| mean machine(expression, adjective, mean, severe, harsh) |
| menacing(adjective, behavior, aroused negative) |
| militant(adjective, mean, sharp, harsh, cross) |
| monstrous(adjective, severe, evil, nasty, harsh) |
| mordacious(adjective, mean, sharp, harsh, cross) |