| brutish(adjective, evil, nasty, harsh, violent) |
| bullhead(adjective, mean, hard, tough, harsh) |
| by the book(expression, adjective, idiom, strong, hard) |
| cast-iron |
| chilly |
| cold-blooded(adjective, mean, hard, evil, nasty) |
| cold fish(expression, adjective, mean, hard, stubborn) |
| coldhearted(adjective, mean, hard, severe, harsh) |
| committed(adjective, resolute) |
| compassionless(adjective, mean, hard, severe, harsh) |
| courageous(adjective, resolute) |
| cutthroat(adjective, mean, hard, severe, harsh) |
| dauntless(adjective, resolute) |
| dead set(adjective, determined, resolute, uncompromising, unshakeable) |
| dead set on(expression, adjective, idiom, harsh, cruel) |
| degenerate(adjective, evil, nasty, harsh, vicious) |
| deliberate(adjective, resolute) |
| demanding |
| demoniac(adjective, evil, nasty, harsh, vicious) |
| depraved(adjective, evil, nasty, harsh, vicious) |