| cruel(adjective, harsh, determined, fierce, persistent) |
| dauntless(adjective, determination, bravery, persistence) |
| dead set on(expression, adjective, idiom, harsh, cruel) |
| dedicated(adjective, determination, bravery, persistence) |
| dogged(adjective, harsh, cruel, determined, fierce) |
| fearless(adjective, determination, bravery, persistence) |
| ferocious(adjective, strong, harsh, cruel, determined) |
| fierce(adjective, harsh, cruel, determined, persistent) |
| grim(adjective, harsh, cruel, determined, fierce) |
| hang-tough(adjective, harsh, cruel, determined, fierce) |
| harsh(adjective, cruel, determined, fierce, persistent) |
| impregnable(adjective, determination, bravery, persistence) |
| incalculable |
| inexhaustible(adjective, determination, bravery, persistence) |
| inhuman(adjective, harsh, cruel, determined, fierce) |
| insistent(adjective, determination, bravery, persistence) |
| insuperable |
| motivated(adjective, determination, bravery, persistence) |
| supreme |
| unabated |