| determined(adjective, firm, sensible, harsh, solid) |
| steadfast(adjective, keen, firm, sensible, solid) |
| stubborn(adjective, characteristic, quality, tough, firm) |
| persistent(adjective, tough, intense, deliberate, determined) |
| firm(adjective, tough, solid, intense, deliberate) |
| resolved(adjective, determined, serious, resolute, persistent) |
| dogged(adjective, tough, firm, harsh, solid) |
| resolute(adjective, tough, firm, sensible, solid) |
| inflexible(adjective, tough, firm, harsh, cruel) |
| unwavering(adjective, firm, sensible, solid, intense) |
| persevering(adjective, tough, firm, determined, unreasonable) |
| rigid(adjective, tough, severe, firm, harsh) |
| tenacious(adjective, tough, intense, deliberate, determined) |
| adamant(adjective, tough, harsh, cruel, determined) |
| inexorable(adjective, tough, firm, harsh, intense) |
| purposeful(adjective, keen, enthusiastic, determined, serious) |
| relentless(adjective, tough, firm, intense, cruel) |
| unflinching(adjective, harsh, cruel, determined, fierce) |
| unyielding(adjective, tough, firm, harsh, cruel) |
| dedicated(adjective, keen, firm, solid, intense) |