| compassionless(adjective, mean, severe, harsh, cruel) |
| constancy |
| continued(adjective, strong, firm, determined, steady) |
| convinced(adjective, determined, fixed, stubborn, dogmatic) |
| cool |
| coolheaded |
| cussed(adjective, persistent, obstinate, insistent, dogged) |
| cutthroat(adjective, mean, severe, harsh, cruel) |
| defiant(adjective, persistent, obstinate, insistent, dogged) |
| defined(adjective, certain, limited, definite, inflexible) |
| deliberate(adjective, resolute) |
| demanding(adjective, persistent, obstinate, insistent, dogged) |
| determinate(adjective, certain, limited, definite, inflexible) |
| disobedient(adjective, persistent, obstinate, insistent, dogged) |
| dog-eat-dog(adjective, mean, severe, harsh, cruel) |
| doughty |
| driven(adjective, serious, resolute, persistent, unwavering) |
| exacting(adjective, persistent, obstinate, insistent, dogged) |
| ferocious(adjective, harsh, cruel, determined, fierce) |
| fiducial |