| avaricious(adjective, hard, tough, harsh, cruel) |
| awful(adjective, wicked) |
| backbreaking(adjective, tough, severe, rough, difficult) |
| base(adjective, wicked) |
| benumbed(adjective, hard, tough, severe, cold) |
| bleak(appearance, terrible, hopeless) |
| bound(adjective, harsh, cruel, determined, fierce) |
| bound and determined(expression, adjective, idiom, harsh, cruel) |
| brute |
| burdensome(adjective, tough, severe, rough, difficult) |
| cantankerous(adjective, hard, tough, severe, cold) |
| ceaseless(adjective, persistent, constant, pitiless, unyielding) |
| churlish(adjective, hard, tough, severe, cold) |
| closed(adjective, coldhearted) |
| cold fish(expression, adjective, hard, tough, severe) |
| complicated(adjective, tough, rough, difficult, heavy) |
| continual(adjective, persistent, constant, pitiless, unyielding) |
| continuous(adjective, persistent, constant, pitiless, unyielding) |
| contrary(adjective, senseless, unwarranted, reckless, malicious) |
| criminal(adjective, wicked) |